OXYPURINE NUCLEOSIDES AND THEIR CONGENERS, AND ACYL DERIVATIVES THEREOF, FOR IMPROVEMENT OF HEMATOPOIESIS

Abstract: The invention relates to certain oxypurine nucleosides, congeners of such oxypurine nucleosides, and acyl derivatives thereof, and compositions which contain at least one of these compounds. The invention also relates to methods of treating or preventing hematopoietic disorders and modifying hematopoiesis by administering a compound or composition of the present invention to an animal.

Description: OXYPURINE NUCLEOSIDES AND THEIR CONGENERS, AND ACYL DERIVATIVES THEREOF, FOR IMPROVEMENT OF HEMATOPOIESIS This application is a continuation-in-part application of copending U.S. Application Serial No. 487,984, filed February 5, 1990, which in turn is a continuation-in- part application of U.S. Application Serial No. 533,933, filed June 5, 1990. Both of these applications are hereby incorporated by reference. Field of the Invention This invention relates generally to oxypurine nucleosides including guanosine, deoxyguanosine, inosine, xanthosine, deoxyxanthosine and deoxyinosine, congeners of these nucleosides, and acyl derivatives of these nucleosides and congeners, and to the prophylactic and therapeutic uses of these compounds. The invention also relates to the administration of these compounds, alone or in combinations, with or without nonionic surfactants or other agents, to animals. These compounds are capable of modifying hematopoiesis in intact, normal animals and in animals with damage to or deficiencies of the hematopoietic system caused by irradiation, chemotherapy, poisoning, disease, or the like. Compounds of the subject invention also improve host leukocyte-mediated defenses against infection. Background of the Invention A major complication of cancer chemotherapy, of antiviral chemotherapy, or of exposure to ionizing radiation is damage to bone marrow cells or suppression of their function. Specifically, chemotherapy and exposure to ionizing radiation damage or destroy hematopoietic progenitor cells, primarily found in the bone marrow and spleen, impairing the production of new blood cells (granulocytes, lymphocytes, erythrocytes, onocytes, platelets, etc.). Treatment of cancer patients with cyclophosphamide or 5-fluorouracil , for example, destroys leukocytes (lymphocytes and/or granulocytes) , and can result in enhanced susceptibility of the patients to infection. Many cancer patients die of in¬ fection or other consequences of hematopoietic failure subsequent to chemotherapy or radiation therapy. Chemotherapeutic agents can also result in subnormal formation of platelets which produces a propensity toward hemorrhage. Similarly, mustard gas poisoning results in damage to the hematopoietic system, leaving one more susceptible to infection. Inhibition of erythrocyte production can result in anemia. Failure of the surviving bone marrow stem cells to proliferate and differentiate rapidly enough to replenish leukocyte populations results in the inability of the body to resist pathogenic infectious organisms. Various disease states, such as neutropenia, including idiopathic forms, are also related to impairment of specific components of the hematopoietic system. Compounds which improve or aid in the restoration of hematopoiesis after bone marrow damage or suppression caused by chemicals, radiation, disease, or other pathological conditions associated with deficient hematopoiesis, are useful as therapeutic and prophylactic agents. Several polypeptide hematopoietic growth factors (produced primarily through recombinant DNA technology) are known. These hematopoietic growth factors, which include * erythropoietin (EPO) , the interleukinε (especially « Interleukin-l, Interleukin-3, and Interleukin-6) and the colony-stimulating factors (such as granulocyte colony- stimulating factor, granulocyte/macrophage colony-stimulating factor, or stem-cell colony-stimulating factor), have been reported to have some utility in improving hematopoiesis. Some agents broadly characterized as "biological response modifiers" (BRM's) can also enhance some indices of hematopoiesis. BRM's which modify hematopoiesis include agents like bacterial endotoxin, double-stranded RNA, azimexone, glucans and other yeast and bacterial polysaccharides, dextran sulfate, maleic acid divinyl ether polyanion (MVE2), and tumor necrosis factor. D.W. Bennett and A.N. Drury, J. Physiol. 72:288 (1931) disclosed that the administration of 100 mg of guanosine to rabbits by intraperitoneal injection resulted in an intense decline in leukocyte counts. Initial levels of leukocyte counts were 7700 per mm 3 , but after administration of guanosine, the leukocyte counts declined to only 500 to 1000 per mm 3 . After 10 hours, and for 24 hours thereafter, there was leukocytosis (11,000 per mm 3 ). D.G. Wright, Blood 69:334-337 (1987) reported the effect of guanosine and guanine on cultures of a specific human myeloid leukemia cell line (HL-60). The conversion of immature blast cells into mature granulocytes in vitro was reported to be induced by various chemical agents (including retinoic acid, dimethylformamide and tiazofurin). Incubation of HL-60 cells with guanine or guanosine prevented their induced maturation into functional neutrophils; incubation with inosine had no effect on induced maturation. A.K. Oshita, et al.. Blood 49:585-591 (1977) suggested that cyclic nucleotides (e.g., 3',5'-cylic adenosine monophosphate (cAMP) or 3',5'-cyclic guanosine monophosphate (cGMP)) may participate in the regulation of cell proliferation. In mouse bone marrow cells in culture, cGMP produced an increase in the number of colonies formed under stimulatory influence of serum taken from endotoxin-treated mice. cGMP had no effect in the absence of post-endotoxin serum. 5'-guanosine monophosphate and cAMP were inactive. Beljanski et al. f Cancer Treat. Rep. 67:611-619 (1983) disclosed that partial hydrolysis of E. coli ribosomal RNA yields short (approximately 40 bases) oligonucleotides that have some demonstrable leukopoietic activity in rabbits treated with cyclophospha ide. The authors proposed that the oligonucleotides were acting as replication primers for DNA synthesis in bone marrow cells. They also disclosed that the polyribonucleotides polyguanosine monophosphate, polyadenosine monophosphate, and a copolymer of adenine and guanine nucleotides failed to stimulate leukocyte formation. T. Sugahara et al., Brookhaven Symposia in Biology:284- 302 (1968) reported that yeast RNA hydrolysate, mixtures of adenosine, cytidine, guanosine, uridine, and their corresponding 3'-ribonucleoside- monophosphates did not improve survival after acute lethal doses of ionizing radiation. The compounds improved survival of mice when administered periodically during repeated exposure to sublethal doses of gamma irradiation. The authors stated that the treatment agents were not improving proliferation or differentiation of surviving stem cells, but were apparently prolonging the survival of damaged mature cells. The hydrolysate, the ribonucleosides, and the ribonucleoside monophosphates all decreased the numbers of nucleated cells and hematopoietic cell colonies (colony-forming units) in spleen and bone marrow (the major sites of hematopoiesis) compared to irradiated untreated control mice. Goodman et al. (US patents 4539205, 4849411, and 4643992) disclose the use of aldosyl guanine derivatives having substituents having an electron-withdrawing effect greater than hydrogen in the 8 position of the guanine moiety, for modulating immune response. Some acyl derivatives of oxypurine nucleosides have been synthesized for use as protected intermediates in the synthesis of oligonucleotides or analogs of nucleosides or nucleotides. See Sigma Chemical Company 1991 catalog, pages 1702-1704. W.A. Fleming and T.A. McNeill, J. Cell. Physiol. 88:323-330 (1976) reported that the nonionic surfactant compounds Polysorbate 80 and Saponin increase the responsiveness of bone marrow cells in culture to the influence of sub-optimal amounts of colony stimulating factors. The surfactants were active over a very narrow concentration range, with maximum activity at 10 ng/ml, and minimal activity at concentrations ten-fold greater or ten- fold lower. The effect of surfactants on hematopoiesis in vivo was not examined. Objects of the Invention It is a primary object of this invention to provide a family of compounds which effectively promote or otherwise modify hematopoiesis. Administration of these compounds to an animal before, during or after damage to the hematopoietic system, prevents or treats the hematopoietic disorders. It is a further object of this invention to provide a family of compounds for the treatment of a variety of hematological disorders and other pathological conditions involving low blood cell counts. It is a further object of this invention to provide a family of compounds to improve host leukocyte-mediated defenses against infection. It is a further object of the invention to provide compounds which can modify hematopoiesis and which can be administered orally or parenterally. Summary Of The Invention These and other objects of the invention are achieved by oxypurine nucleosides such as guanosine, inosine, xanthosine, deoxyxanthosine, deoxyinosine, and deoxyguanosine, congeners of such oxypurine nucleosides, and acyl derivatives of such oxypurine nucleosides and congeners, which can be administered to animals, including mammals such as humans. The administration of these compounds alone, or in combi¬ nation, is useful in modifying hematopoiesis in an animal. Thus, the compounds of the invention, alone or in combinations, are useful in the treatment of disorders of hematopoiesis induced by irradiation or chemical agents; are useful as adjuncts to cancer and anti-viral chemotherapy; are useful to improve host leukocyte-mediated defenses against infection; and are useful for the treatment of other pathological conditions. An important aspect of this invention is the discovery that oxypurine nucleosides such as guanosine, deoxyguanosine, inosine, xanthosine, deoxyxanthosine and deoxyinosine, congeners of such nucleosides and acyl derivatives of such nucleosides and congeners, have unexpected therapeutic properties. The invention also encompasses the discovery that surfactant compounds administered in vivo can enhance the effect of hematopoietic stimulants, including, but not limited to the compounds of the invention, erythropoietin, colony stimulating factors, or interleukins. Compounds of the Invention In all cases except where indicated, letters and letters with subscripts symbolizing variable substituents in the chemical structures of the compounds of the invention are applicable only to the structure immediately preceding the description of the symbol. The compounds useful in modifying hematopoiesis have the following structure: R λ = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and - j = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and Z = H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and L = H or OR,,, where R. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and M = H or OR.., where R. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, with the proviso that at least one of and M is H, and Q = H, a halogen, NHR P where R F is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR., where 1^ is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and the C-C bond between the 2' and 3' positions of the aldose moiety is optionally present. Novel compositions of the invention include the above-noted compounds (optionally as pharmaceutically acceptable salts) wherein at least one of R A , R-,, R-., R- or R. is not H, and in compounds where Z is NH 2 or NHR C , Q is then H or NHR, where S- is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, along with a pharmaceutically acceptable carrier. Broadly, guanosine, its congeners, and acyl derivatives thereof are represented by the formula (I): ( I ) wherein R A , R.,, R c and ,, are the same, or different, and each is hydrogen (H) or an acyl radical, and Q = H, a halogen, NHR P where R F is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, =0, or 0R H where R B is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. Broadly, inosine, its congeners, and acyl derivatives thereof are represented by the formula (II) (ID wherein R Λ , R B , and R D are the same, or different, and each is H or an acyl radical, and Q = H, a halogen, NHR-. where R F is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, SR C where R c is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, =0, or 0R H where R κ is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. Broadly, xanthosine, its congeners, and acyl derivatives thereof are represented by the formula (III) (III) wherein R A R B , and R D are the same, or different, and each is H or an acyl radical, and Q = H, a halogen, NHR F where R P is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, =0, or 0R„ where R H is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. Broadly, deoxyinosine, its congeners, and acyl derivatives thereof are represented by the formula (IV): (IV) 12 wherein R A and - j are the same, or different, and each is H or an acyl radical, and Q = H, a halogen, NHR P where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, =0, or 0R H where R π is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. Broadly, deoxyguanosine, its congeners, and acyl derivatives thereof are represented by the formula (V) : (V) wherein R A , R,,, and R c may be the same or different, and each is hydrogen (H) or an acyl radical, and Q = H, a halogen, NHR P where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, =0, or OR H where R H is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. Broadly, deoxyxanthosine, its congeners, and acyl derivatives thereof are represented by the formula (VI) : (VI) wherein λ and R B are the same, or different, and each is H or an acyl radical, and Q = H, a halogen, NHR P where R F is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, =0, or 0R H where R H is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. Broadly, inosine 2 ' ,3'-acyclic dialcohol, its congeners, and acyl derivatives thereof are represented by the formula (VII): wherein R A , R B , and R D are the same, or different, and each is H or an acyl radical, and Z is H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and Q = H, a halogen, NHR F where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, =0, or 0R H where R H is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. The classes of novel derivatives that are desirable in terms of both efficacy and safety when used in accordance with the invention are: (1) acyl derivatives of guanosine or its congeners having the formula: 15 wherein R A , R„, and R-, are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 6 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R D , and R D are hydrogen; and R c is hydrogen or an acyl group derived from i. an unbranched fatty acid with 3-22 carbon atoms, ii. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, iii. a dicarboxylic acid having 3-22 carbon atoms, 16 iv. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, v. a nicotinic acid, or vi. a substituted or unsubstituted aromatic carboxylic acid with 7 to 22 carbon atoms, and J = H or NHR X where R z is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (2) acyl derivatives of inosine or its congeners having the formula wherein R A is hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. a dicarboxylic acid having 3-22 carbon atoms, c. nicotinic acid or d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms; and wherein R B and/or R D are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and Q = H, a halogen, NHR P where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R c is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R„ is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (3) acyl derivatives of xanthosine or its congeners having the formula: wherein R A , R ^ , and R- are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and Q = H, a halogen, NHR P where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR C where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, O divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R,. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (4) acyl derivatives of deoxyinosine or its congeners having the formula: wherein R A and R,, are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that at least one of R A and R B is not hydrogen, and Q = H, a halogen, NHR P where is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, o divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, 20 or OR-, where R., is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (5) acyl derivatives of deoxyguanosine or its congeners having the formula: wherein R A , R B , and R c may be the same or different, and each is hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine, phenylalanine, and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, e. nicotinic acid provided that not all of R A , R B , and R c are hydrogen; and where R c is not H, then R A and/or R B may also be acetyl, and J = H or NHR r where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; 9 21 (6) acyl derivatives of deoxyxanthosine or its congeners having the formula: wherein R A and R B are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that at least one of R A and R B is not hydrogen, and Q ■ H, a halogen, NHR r where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR-, where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the 92 1 22 carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (7) acyl derivatives of inosine acyclic 2' ,3'-dialcohol or its congeners having the formula: wherein R A , R B , and R D are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R are hydrogen, and Q = H, a halogen, NHR P where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R-. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, O divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR-, where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and Z is H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms. For all of the above structures, where the substituent at the 2 position of the purine base (Z) or at the 8 position of the purine base (Q or L) is attached to the purine base with a double bond (e.g. =0 or =S), the adjacent carbon-nitrogen double bond in the purine base becomes a single carbon-nitrogen bond and an additional hydrogen is then present on the nitrogen of that carbon-nitrogen single bond. Also encompassed by the invention are the pharmaceutically acceptable salts of the above-noted compounds. Brief Description of the Drawings Fig. 1 is a graph comparing spleen weight of mice after treatment with saline, guanine and guanosine as described in Example 31. (In this figure and each figure hereafter an asterisk (*) indicates statistically significant differences. ) Fig. 2 is a graph comparing white blood cell count in mice after treatment with saline, guanine and guanosine as described in Example 31. Fig. 3 is a graph comparing neutrophils in mice after treatment with saline, guanine and guanosine as described in Example 31. Fig. 4 is a graph comparing spleen weight of mice after treatment with saline, Tween-80, guanosine, triacetylguanosine, octanoylguanosine, laurylguanosine and palmitoylguanosme as described in Example 32. Fig. 5 is a graph comparing white blood cell count in mice after treatment with saline, Tween-80, guanosine, triacetylguanosine, octanoylguanosine, laurylguanosine and palmitoylguanosme as described in Example 32. Fig. 6 is a graph comparing neutrophils in mice after treatment with saline, Tween-80, guanosine, triacetylguanosine, octanoylguanosine, laurylguanosine and palmitoylguanosme as described in Example 32. Fig. 7 is a graph showing colonies per femur after cyclophosphamide treatment as described in Example 34. Fig. 8 is a graph comparing spleen weight of mice after treatment with saline, Tween-80 and palmitoylguanosme for various periods as described in Example 35. Fig. 9 is a graph comparing white blood cell count in mice after treatment with saline, Tween-80 and palmitoylguanosme as described in Example 35. Fig. 10 is a graph comparing neutrophils in mice after treatment with saline, Tween-80 and palmitoylguanosme as described in Example 35. Fig. 11 is a graph comparing lymphocytes in mice after treatment with saline, Tween-80 and palmitoylguanosme as described in Example 35. Fig. 12 is graph comparing spleen weight of mice after treatment with saline and palmitoylguanosine as described in Example 36. "5FU" is 5-fluorouracil. Fig. 13 is a graph comparing lymphocytes in mice after treatment with saline and palmitoylguanosine as described in Example 36. Fig. 14 is a graph comparing neutrophils in mice after treatment with saline and palmitoylguanosine as described in Example 36. Fig. 15 is a graph comparing white blood cell count in mice after treatment with saline and palmitoylguanosine as described in Example 36. Fig. 16 is a graph showing platelets in mice after treatment with saline and palmitoylguanosine as described in Example 37. Fig. 17 is a graph comparing spleen weight of mice after treatment with saline and palmitoylguanosine as described in Example 37. Fig. 18 is a graph showing neutrophils in mice after treatment with saline and palmitoylguanosine as described in Example 37. Fig. 19 is a graph showing white blood cell count in mice after treatment with saline and palmitoylguanosine as de¬ scribed in Example 37. Fig. 20 is a graph comparing spleen weight of mice after treatment with Tween-80, palmitoylguanosine and palmitoyldeoxyinosine as described in Example 38. Fig. 21 is a graph comparing white blood cell count in mice after treatment with Tween-80, palmitoylguanosine and palmitoyldeoxyinosine as described in Example 38. Fig. 22 is a graph comparing neutrophils in mice after treatment with Tween-80, palmitoylguanosine and palmitoyldeoxyinosine as described in Example 38. Fig. 23 is a graph comparing spleen weight of mice after treatment with saline, Tween-80 and octanoylguanosine at various concentrations as described in Example 39. Fig. 24 is a graph comparing white blood cell count in mice after treatment with saline, Tween-80 and octanoylguanosine at various concentrations as described in Example 39. Fig. 25 is a graph comparing neutrophils in mice after treatment with saline, Tween-80 and octanoylguanosine as described in Example 39. Fig. 26 is a graph comparing spleen weight of mice after treatment with saline, Tween-80 and octanoylguanosine as described in Example 40. Fig. 27 is a graph showing the effect of saline, Tween-80 and octanoylguanosine in cyclophosphamide-treated mice on hematopoiesis score as described in Example 40. Fig. 28 is a graph comparing white blood cell count in mice after treatment with saline, Tween-80 and octanoylguanosine as described in Example 40. Fig. 29 is a graph comparing neutrophils in mice after treatment with saline, Tween-80 and octanoylguanosine as described in Example 40. Fig. 30 is a graph comparing white blood cell count in mice after treatment with saline, benzoylguanosine and palmitoylguanosine as described in Example 41. Fig. 31 is a graph comparing neutrophils in mice after treatment with saline, benzoylguanosine and palmitoylguanosine as described in Example 41. Fig. 32 is a graph comparing spleen weight of mice after treatment with saline, benzoylguanosine and palmitoylguanosine as described in Example 41. Fig. 33 is a graph comparing platelets in mice after treatment with saline, benzoylguanosine and palmitoylguanosine as described in Example 41. Fig. 34 is a graph comparing spleen weight of mice after treatment with saline, palmitoylinosine and palmitoyl- xanthosine as described in Example 42. Fig. 35 is a graph comparing white blood cell count in mice after treatment with saline, palmitoyldeoxyinosine and palmitoylxanthosine as described in Example 42. Fig. 36 is a graph comparing neutrophils in mice after treatment with saline, palmitoyldeoxyinosine and palmitoylxanthosine as described in Example 42. Fig. 37 is a graph comparing spleen weight of mice after treatment with saline, palmitoylxanthosine, palmitoylinosine, palmitoylguan'osine, laurylguanosine and octanoylguanosine as described in Example 43. Fig. 38 is a graph comparing white blood cell count in mice after treatment with saline, palmitoylxanthosine, palmitoylinosine, palmitoylguanosine, laurylguanosine and octanoylguanosine as described in Example 43. Fig. 39 is a graph comparing neutrophils in mice after treatment with saline, palmitoylxanthosine, palmitoylinosine, palmitoylguanosine, laurylguanosine and octanoylguanosine as described in Example 43. Figure 40 is a graph comparing neutrophil counts in mice after treatment with Tween-80, palmitoylacyclovir, palmitoylarabinosylhypoxanthine, palmitoyl-8-thioguanosine palmitoyldeox guanosine, palmitoylarabinosylguanine , palmitoyldeoxyinosine, and monopalmitoylguanosine 2',3'- acyclic dialcohol as described in Example 44. Figure 41 is a graph comparing white blood cell counts in mice after treatment with Tween-80, palmitoylacyclovir, palmitoylarabinosylhypoxanthine, palmitoyl-8-thioguanosine palmitoyldeoxyguanosine, palmitoylarabinosylguanine, palmitoyldeoxyinosine, and monopalmitoylguanosine 2',3'-acyclic dialcohol as described in Example 44. Figure 42 is a graph comparing spleen weight in mice after treatment with Tween-80, palmitoylacyclovir, palmitoylarabmosylhypoxanthme, palmitoyl-8-thioguanosine palmitoyldeoxyguanosine, palmitoylarabinosylguanine, palmitoyldeoxyinosine, and monopalmitoylguanosine 2',3'- acyclic dialcohol as described in Example 44. Figure 43 is a graph comparing spleen weight in mice after treatment with Tween-80, 3'-0-palmitoyldeoxyguanosine, butyryldeoxyguanosine, palmitoyl-N-isobutyryldeoxyguanosine , lauryldeoxyguanosine, octanoyldeoxyguanosine, and palmitoyldeoxyguanosine as described in Example 45. Figure 44 is a graph comparing neutrophil counts in mice after treatment with Tween-80, 3'-0- pal itoyldeoxyguanosine, butyryldeoxyguanosine, palmitoyl-N- isobutyryldeoxyguanosine, lauryldeoxyguanosine, octanoyldeoxyguanosine, and palmitoyldeoxyguanosine as described in Example 45. Figure 45 is a graph comparing white blood cell counts in mice after treatment with Tween-80, 3'-0- palmitoyldeoxyguanosine, butyryldeoxyguanosine, palmitoyl-N- isobutyryldeoxyguanosine, lauryldeoxyguanosine, octanoyldeoxyguanosine, and palmitoyldeoxyguanosine as described in Example 45. Figure 46 is a graph comparing spleen weight in mice after treatment with physiological saline, and palmitoyldeoxyguanosine at four different doses: 0.2, 0.4, 1.0 and 2.0 μmoles/mouse as described in Example 46. Figure 47 is a graph comparing white blood cell counts in mice after treatment with physiological saline, and palmitoyldeoxyguanosine at four different doses: 0.2, 0.4, 1.0 and 2.0 μmoles/mouse as described in Example 46. Figure 48 is a graph comparing neutrophil counts in mice after treatment with physiological saline, and palmitoyldeoxyguanosine at four different doses: 0.2, 0.4, 1.0 and 2.0 μmoles/mouse as described in Example 46. Figure 49 is a graph comparing spleen weight in mice after treatment with physiological saline, palmitoyldeoxyguanosine, and palmitoylguanosine at four different doses: 0.2, 0.4, 1.0 and 2.0 μmoles/mouse as described in Example 47. Figure 50 is a graph comparing white blood cell counts in mice after treatment with physiological saline, palmitoyldeoxyguanosine, and palmitoylguanosine at four different doses: 0.2, 0.4, 1.0 and 2.0 μmoles/mouse as described in Example 47. Figure 51 is a graph comparing neutrophil counts in mice after treatment with physiological saline, palmitoyldeoxyguanosine, and palmitoylguanosine at four different doses: 0.2, 0.4, 1.0 and 2.0 μmoles/mouse as described in Example 47. Figure 52 is a graph comparing spleen weight in mice after treatment with physiological saline and palmitoyldeoxyguanosine at six different doses: 0.04, 0.08, 0.2, 0.4, 0.6 or 0.8 μmoles/mouse as described in Example 48. Figure 53 is a graph comparing white blood cell counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine at six different doses: 0.04, 0.08, 0.2, 0.4, 0.6 or 0.8 μmoles/mouse as described in Example 48. Figure 54 is a graph comparing neutrophil counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine at six different doses: 0.04, 0.08, 0.2, 0.4, 0.6 or 0.8 μmoles/mouse as described in Example 48. Figure 55 is a graph comparing white blood cell counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine as described in Example 49. Figure 56 is a graph comparing neutrophil counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine as described in Example 49. Figure 57 is a graph comparing platelet counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine as described in Example 49. Figure 58 is a graph comparing lymphocyte counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine as described in Example 49. Figure 59 is a graph comparing spleen weight in mice after treatment with physiological saline, palmitoyl-8- bromoguanosine, monopalmitoylguanosine 2' ,3'-acyclic dialcohol, palmitoylguanosine, and palmitoyldeoxyguanosine as described in Example 50. Figure 60 is a graph comparing platelet counts in mice after treatment with physiological saline, palmitoyl-8- bromoguanosine, monopalmitoylguanosine 2' ,3'-acyclic dialcohol, palmitoylguanosine, and palmitoyldeoxyguanosine as described in Example 50. Figure 61 is a graph comparing myeloid cell counts per femur in mice after treatment with physiological saline, palmitoyl-8-bromoguanosine, monopalmitoylguanosine 2' ,3'- acyclic dialcohol, palmitoylguanosine, and palmitoyldeoxyguanosine as described in Example 50. Figure 62 is a graph comparing platelet counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine as described in Example 51. Figure 63 is a graph comparing spleen weight in mice after treatment with physiological saline and palmitoyldeoxyguanosine as described in Example 51. Figure 64 is a graph comparing neutrophil counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine as described in Example 51. Figure 65 is a graph comparing white blood cell counts in mice after treatment with physiological saline and palmitoyldeoxyguanosine as described in Example 51. Figure 66 is a graph comparing neutrophil counts in mice after treatment with Tween-80 at different concentrations with and without palmitoylguanosine as described in Example 52. Figure 67 is a graph comparing neutrophil counts in mice treated with saline and palmitoyl 8-aminoguanosine as described in Example 53. Figure 68 is a graph comparing spleen weight in mice treated with saline and palmitoyl 8-aminoguanosine as described in Example 53. The invention, as well as other objects, features and advantages thereof, will be understood more clearly and fully from the following detailed description when read with reference to the accompanying figures which illustrate the results of the experiments discussed in the examples below. Detailed Description of the Invention The subject invention relates to oxypurine nucleosides, congeners of these nucleosides, and acyl derivatives of these nucleosides and their congeners, and the use of these compounds for the modification of hematopoiesis in animals including humans. A. Definitions The term "oxypurine base" as used herein means a purine base with an exocyclic oxygen or hydroxyl group at the 6 position and hydrogen, oxygen, an hydroxyl group or an amino group at the 2 position. The term "oxypurine nucleoside" as used herein means an oxypurine base conjugated from the nitrogen at the 9 position to the 1' position of a 5-carbon aldose. The term oxypurine nucleoside includes but is not limited to the compounds guanosine, inosine, deoxyinosine, xanthosine, deoxyxanthosine, and deoxyguanosine. The term "congener" as used herein means an oxypurine nucleoside with a substituent attached at the 7 or 8 position of the purine ring moiety, and/or an oxypurine nucleoside with a ring-cleaved aldose (e.g. guanosine 2' ,3' dialcohol) . The term "acyl derivative" as used herein means a derivative of an oxypurine nucleoside or congener in which a substantially nontoxic organic acyl substituent derived from a carboxylic acid is attached to one or more of the free hydroxyl groups of the ribose moiety of the oxypurine nucleoside with an ester linkage and/or where such a substituent is attached to the amine substituent on the purine ring of guanosine, with an amide linkage. Such acyl substituents are derived from carboxylic acids which include, but are not limited to, compounds selected from the group consisting of lactic acid, an amino acid, a fatty acid, nicotinic acid, dicarboxylic acids, p-aminobenzoic acid and orotic acid. Advantageous acyl substituents are compounds which are normally present in the body, either as dietary constituents or as intermediary metabolites. The term "pharmaceutically acceptable salts" as used herein means salts with pharmaceutically acceptable acid addition salts of the derivatives, which include, but are not limited to, sulfuric, hydrochloric, or phosphoric acids. The term "coadministered" means that at least two of the compounds of the invention are administered during a time frame wherein the respective periods of pharmacological activity overlap. The term "amino acids" as used herein includes, but is not limited to, glycine, the L forms of alanine, valine, leucine, isoleucine, phenylalanine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, cystine, methionine, tryptophan, aspartic acid, glutamic acid, arginine, lysine, histidine, ornithine, hydroxylysine, carnitine, and other naturally occurring amino acids. The term "fatty acids" as used herein means aliphatic carboxylic acids having 2-22 carbon atoms. Such fatty acids may be saturated, partially saturated or polyunsaturated. The term "dicarboxylic acids" as used herein means fatty acids with a second carboxylic acid substituent. The term "therapeutically effective amount" as used herein refers to that amount which provides therapeutic effects for a given condition and administration regime. 35 B. Compounds of the Invention The compounds of the invention useful in modifying hematopoiesis have the following structure: R A = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and R„ = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and Z = H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and L = H or OR,,, where R. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and M = H or OR E , where R. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, with the proviso that at least one of L and M is H, and Q = H, a halogen, NHR F where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, O divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or 0R H where R κ is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and the C-C bond between the 2' and 3' positions of the aldose moiety is optionally present. Novel compositions of the invention include the above-noted compounds wherein at least one of R A , R,,, R c , R,, or R E is not H, and in compounds where Z is NH 2 or NHR C , Q is then H or NHR, where R- is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, along with a pharmaceutically acceptable carrier. Specifically, novel compounds of the invention include but are not limited to: (1) acyl derivatives of guanosine or its congeners having the formula: wherein R A , R B , and R D are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 6 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the forms of alanine, valine, leucine, isoleucine, 37 tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R„, and R D are hydrogen; and R c is hydrogen or an acyl group derived from i. an unbranched fatty acid with 3-22 carbon atoms, ii. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, iii. a dicarboxylic acid having 3-22 carbon atoms, iv. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, v. a nicotinic acid, or vi. a substituted or unsubstituted aromatic carboxylic acid with 7 to 22 carbon atoms, and J = H or NHR. where R, is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (2) acyl derivatives of inosine or its congeners having the formula: 92/1 38 wherein R A is hydrogen or an acy.1 group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. a dicarboxylic acid having 3-22 carbon atoms, c. nicotinic acid or d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms; and wherein R B and/or R D are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or 39 e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and Q = H, a halogen, NHR F where R P is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R„ is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (3) acyl derivatives of xanthosine or its congeners having the formula: wherein R A , R B , and R D are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R D , and R D are hydrogen, and Q = H, a halogen, NHR P where R P is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR., where R., is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (4) acyl derivatives of deoxyinosine or its congeners having the formula: wherein R A and R B are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that at least one of R A and R B is not hydrogen, and Q = H, a halogen, NHR P where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R„ is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (5) acyl derivatives of deoxyguanosine or its congeners having the formula: 42 wherein R A , R^, and R c may be the same or different, and each is hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine, phenylalanine, and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, e. nicotinic acid provided that not all of R A , R-, and R c are hydrogen, and where R c is not H, then R A and/or R B may also be acetyl, and J = H or NHR-. where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (6) acyl derivatives of deoxyxanthosine or its congeners having the formula: wherein R A and R^ are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that at least one of R A and R„ is not hydrogen, and Q = H, a halogen, NHR F where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or 0R„ where R., is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; (7) acyl derivatives of inosine acyclic 2' ,3'-dialcohol or its congeners having the formula: wherein R A , R B , and R D are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and Q = H, a halogen, NHR F where R F is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR-. where R-. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, o divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR- j where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and Z is H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms. Also encompassed by the invention are the pharmaceutically acceptable salts of the above-noted compounds. Advantageous compounds of the invention are fatty acid esters of deoxyguanosine, deoxyinosine, guanosine, inosine, deoxyxanthosine and xanthosine, especially those with 8 or more carbon atoms in the acyl substituent. Particularly advantageous compounds are fatty acid esters of deoxyguanosine or deoxyinosine with 12 to 18 carbon atoms in the acyl substituent. Compounds with a polar amino acid substituent, e.g. lysine or arginine, conjugated to either a hydroxyl group on the aldose moiety or to the exocyclic amino group of guanosine or deoxyguanosine, and optionally with a fatty acid esterified to a hydroxyl group on the aldose moiety, are particularly suited for formulation in aqueous pharmaceutical carriers. In one embodiment of the invention, prodrugs of the compounds of the invention with enhanced water solubility are prepared by attaching phosphate'to a free hydroxy group on the aldose moiety of the purine nucleoside. In another embodiment, substituents, such as short chain alkyl or substituted alkyl radicals, e.g. methyl, ethyl or propyl, are attached at the 1,3, and/or 7 position of the oxypurine moiety of the above-described compounds. In another embodiment of the invention, the exocyclic amino group of guanosine, deoxyguanosine or their congeners may have two acyl substituents, which may be the same or different. In such cases, the acyl substituents are selected from the groups of acyl radicals designated as R c in the descriptions for guanosine, deoxyguanosine and their congeners. Nonionic Surfactants It has been found that a variety of nonionic surfactants including but not limited to polyoxyethylene sorbitan acylates e.g. Tween 80 [polyoxyethylene sorbitan ono-oleate], Tween 60 [polyoxyethylene sorbitan monostearate] , etc.; polyoxyethylene ethers, e.g. Brij 96 [polyoxyethylene-10-oleyl ether] and Triton X-100; or ethylene oxide condensates, e.g. Nonidet 40-P [octylphenol-ethylene oxide condensate]) enhance the effect of compounds of the invention on hematopoiesis in vivo. Further, these surfactants alone accelerate hematopoietic recovery after bone marrow damage caused by cytoreductive agents such as cyclophosphamide (see Example 52). Novel compositions of the invention include one or more of the above-noted nonionic surfactants and erythropoietin, an interleukin, a colony- stimulating factor, or another compound capable of stimulating hematopoiesis. Compositions of the Invention In one embodiment of the invention, novel pharmaceutical compositions comprise as an active agent one or more oxypurine nucleosides selected from guanosine, inosine, xanthosine, deoxyxanthosine, deoxyinosine, deoxyguanosine, congeners of these oxypurine nucleosides, and acyl derivatives of these oxypurine nucleosides and congeners, together with a pharmaceutically acceptable carrier. In another embodiment, the compounds of the invention include in addition to one or more compounds of the invention and at least one of the following compounds which affect hematopoiesis: a nonionic surfactant, an interleukin such as IL-l,-2,-3,-4,-5,-6,-7,-8 (advantageously IL-1, 3, and 6), a colony-stimulating factor, for example granulocyte colony-stimulating factor (G-CSF), granulocyte/macrophage colony-stimulating factor (GM-CSF) , erythropoietin (EPO), glucan, polyinosine-polycytidine, or any other agent having beneficial effects on hematopoiesis. The compositions, depending on the intended use, are manufactured in the form of a liquid, a suspension, a tablet, a capsule, a dragee, an injectable solution, a topical solution, or a suppository (see discussion of formulation below) . In another embodiment of the invention, the composition comprises at least one compound of the invention and a radioprotective compound. In another embodiment of the invention, the composition comprises at least one compound of the invention and an antiviral or antineoplastic agent, or other pharmaceutical agent which decreases blood cell counts. Therapeutic Uses of the Coapounds and Coapositions of the Invention The compounds of the invention are useful to modify, improve, or aid in the process of hematopoiesis and immune system function in animals. The compounds restore hemato¬ poiesis or blood cell counts after bone marrow damage or suppression caused by chemicals, radiation, or disease; protect against damage due to chemicals, radiation, or disease; and modify blood cell (e.g. leukocyte and platelet) counts or activity in animals. The compounds of the invention are useful in treating humans; however, the invention is not intended to be so limited, it being within the contemplation of the invention to treat all animals that experience a beneficial effect from the administration of the active compounds of the invention. Substantial amelioration of effects of ionizing radiation is obtained, where the compounds of the invention are used in conjunction with a radioprotective compound. The invention is furthermore embodied in the systemic administration of a pharmaceutical compound or composition containing guanosine, deoxyguanosine, inosine, xanthosine, deoxyxanthosine, deoxyinosine, congeners of such nucleosides or acyl derivatives of such nucleosides or congeners, or in combinations, for the purpose of improving hematopoiesis in patients with depressed blood cell counts, impaired bone marrow function or who are otherwise in need of increased hematopoietic activity. Specific conditions where advantages are achieved using the compounds, compositions, and methods of the invention include situations where improvement of hematopoiesis is desired. Such conditions include treating animals, e.g. human patients, subjected to cytoreductive cancer chemotherapy, antiviral chemotherapy, therapeutic or accidental exposure to ionizing radiation, animals in need of improved host leukocyte-mediated defense against infection, and animals with anemia or bone marrow hypoplasia caused by disease or accidental poisoning. Advantages are also achieved using the compounds, compositions, and methods of the invention in the following ways: increasing leukocyte counts in animals with normal cell counts, e.g. for improving host resistance to infection, increasing thrombocyte counts in animals with normal cell counts, for example for improving blood-clotting potential (e.g., before surgery), pretreatment of animals scheduled to undergo anticancer or antiviral chemo¬ therapy (or therapeutic irradiation) , pretreatment of bone marrow transplant donors, accelerating or improving recovery after bone marrow transplants, treatment of bone marrow cells in culture prior to transplant, treatment of bone marrow cells in culture (for either research purposes or prior to transplant). Specifically included are veterinary applica¬ tions requiring modulation of blood cell counts. Cytopenias The compounds and compositions of the invention are useful in the treatment of cytopenias as enumerated and discussed below: A. Neutropenia Neutropenia due to cancer or cancer chemotherapy; neutropenia due to antiviral chemotherapy; neutropenia due to exposure to ionizing radiation (accidental or therapeutic exposure); neutropenia due to immunosuppressive chemotherapy (e.g. treat¬ ment of autoimmune disorders like rheumatoid arthritis with cytotoxic drugs); neutropenia in burn patients (neutropenia is common in patients with severe burns) ; neutropenia due to viral infections (e.g. pancytopenia often found in AIDS patients, which is exaggerated by treatment with myelosuppressive drugs such as AZT); neutropenia secondary to aplastic anemia or myelodysplastic syndrome; neutropenia due to poisoning (e.g. benzene; also, a number of ethical pharmaceutical agents list agranulocytosis as a side effect) ; idiopathic neutropenia; chronic neutropenia; neutropenia due to hairy cell leukemias or other ly phocytic leukemias; neutropenia from any other causes; neutropenia in non-human animals (veterinary conditions). B. Throabocytopenia Low thrombocyte (platelet) counts due to cancer chemotherapy; thrombocytopenia due to antiviral chemotherapy; thrombocytopenia due to exposure to ionizing radiation (acci¬ dental or therapeutic exposure) ; low thrombocyte counts due to immunosuppressive chemotherapy (e.g. treatment of autoimmune disorders like rheumatoid arthritis with cytoxic drugs); thrombocytopenia due to'viral infections (e.g. pancytopenia often found in AIDS patients, which is exaggerated by treatment with myelosuppressive drugs such as AZT); thrombocytopenia secondary to aplastic anemia, myelodysplastic syndrome or hypoplastic bone marrow syndromes; thrombocytopenia from any other cause. C. Lyaphocytopenia Low lymphocyte counts due to cancer chemotherapy; lymphocytopenia due to antiviral chemotherapy; Low lymphocyte counts due to exposure to ionizing radiation (accidental or therapeutic exposure); low lymphocyte counts due to immunosuppressive chemotherapy (e.g. treatment of autoimmune disorders like rheumatoid arthritis with cytotoxic drugs); lymphocytopenia from any other cause. D. Aneaia Low erythrocyte counts due to kidney dialysis; low erythrocyte counts due to kidney damage; aplastic anemia; anemia due to viral infections or myelosuppressive chemotherapy agents; anemia due to infection or disease (e.g. malaria); anemia due to hemorrhage; anemia from any other cause. Treatment of Complications Associated with Radiation Exposure Three situations wherein active compounds of the in¬ vention may be clinically useful in treating radiation damage are 1) accidental exposure to ionizing radiation, as in a nuclear accident; 2) diagnostic exposure to radiation during radiography; and 3) therapeutic exposure to radiation, such as in radiotherapy of cancer. In the first case, in one embodiment, the active compounds are administered in a formulation suitable for parenteral injection, followed by oral or parenteral administration once to several times per day of doses sufficient to enhance hematopoiesis, e.g. 0.01 to 3 grams per day. In the second case, X-ray exposure during diagnostic radiography, in one embodiment, active compounds are given orally before and after exposure. In the third case, during cancer radiotherapy, the active compounds are particularly useful in restoring bone marrow function after its undesirable but unavoidable suppression during irradiation. The compounds of the invention are administered before, during, and/or after exposure to radiation. The compounds of the invention are useful for prevention or amelioration of the effects of ionizing radiation when coadministered with other radioprotective compounds such as WR-2721, NAC, DDC, cysteamine, 2- aercaptoethanol, mercaptoethylamine, dithiothreitol, glutathione, 2- mercaptoethanesulfonic acid, WR-1065, nicotinamide, 5-hydroxytryptamine, 2-beta-aminoethyl- isothiouronium-Br-Hbr, glucans, GLP/B04, GLP/B05, OK-432, Biostim, PSK, Lentinan, Schizophyllan, Rhodexman, Levan, Mannozy , MVE-3, MNR, MMZ, IL-1, IL-2, TNF, thymic factor TF-5, glutathione peroxidase, superoxide dismutase, catalase, glutathione reductase, glutathione transferase, selenium, CdC12, MnC12, Zn acetate, vitamin A, beta carotene, prostaglandins, tocopherol and methylene blue and PABA. The administration of these protective compounds along with the compounds of the invention provides protection greater than if the compounds or the other radioprotective agents are given alone. Treatment of Complications Associated with Cancer Chemotherapy The white blood cell counts, and particularly the neutrophil counts, of patients treated with standard anti- neoplastic chemotherapy agents (e.g., 5-fluorouracil, fluorodeoxyuridine, vinca alkaloids, cyclophosphamide and other alkylating agents such as busulfan, hexalen or melphalan, daunorubicin, doxorubicin, methotrexate, cytosine arabinoside, 6-mercaptopurine, 6-methylmercaptopurine riboside, thioguanosine, podophyllotoxins, cisplatin, combinations of such cytoreductive agents, or cytoreductive agents plus modulators like leucovorin, PALA, or WR-2721) are often greatly diminished. Daily oral administration (or parenteral injection) of an effective dose, (for example, 0.01 - 3.0 grams) of a compound of the invention such as pal itoyl- (or other acyl derivatives of) deoxyguanosine for a number of days diminishes or abolishes the neutrophil nadir, which would otherwise occur several days after chemotherapy is initiated. Treatment of recipients of chemotherapeutic agents with the acylated deoxyguanosine also greatly increases the total white blood cell count, including neutrophils and lymphocytes, on subsequent days compared to patients receiving only the chemotherapeutic regimen. This reduces the likelihood of in¬ fection throughout the course of treatment, and makes it possible for the patient to receive larger doses of the chemotherapeutic agents and/or to receive repeated doses sooner than comparable patients not treated with the deoxyguanosine derivative(s) . The compounds of the invention are administered before, during, and/or after administration of the anti- neoplastic agents. Treatment of Complications Associated with Antiviral Chemotherapy Treatment of patients with AIDS or AIDS-Related Complex with azidothymidine (AZT) and other antiviral agents is complicated by anemia, neutropenia, and thrombocytopenia. Administration of appropriate doses of a compound of the invention such as palmitoylguanosine (or other acylated forms of guanosine) for a number of days (or, depending on the protocol of antiviral treatment, throughout the course of treatment) greatly diminishes the AZT- and/or ddC-induced neutropenia, anemia, thrombocytopenia, and other side effects. This reduces the probability of septic complications and allows the patients to receive larger doses of the antiviral compounds over a shorter time period than patients not also treated with a compound of the invention. The compounds of the invention are administered before, during, and/or after administration of antiviral agents. Treatment of Complications Associated with Poisoninσ and Side Effects of Various Drugs Benzene poisoning or side effects of a variety of sub¬ stances including numerous prescription drugs, such as anti- thyroid drugs, sulfonamide, phenylthiazines, phenylbutazones, and aminopyrines result in agranulocytosis/neutropenia. Cytopenia is also caused by benzene poisoning and by mustard gas and related alkylating agents. Administration of the compounds of the invention to the victims of such poisoning or the recipients of such drugs, improves recovery by stimulating the production of blood cells such as neutrophils. Treatment of Cytopenias Associated with Various Diseases Numerous diseases are associated with various forms of cytopenia. For example, hairy cell leukemia is associated with neutropenia. Thrombocytopenic purpura and aplastic anemia are associated with reduced levels of platelets. Administration of the compounds of the invention increases levels of neutrophils and of platelets in those afflicted with such diseases. Treatment of Complications Associated with HIV Infection HIV-infected patients, especially those afflicted with AIDS, suffer from a variety of symptoms and diseases which result from and, in some cases, further exacerbate a severely compromised immune system. Many of these patients are given antiviral chemotherapeutic agents, such as AZT, which also have detrimental effects on the body's immune function, further lowering resistance to infections of all kinds. Administration of the compounds of the invention - orally, intravenously, or by parenteral injection - raises the low blood cell counts due to viral infections, countering the pancytopenia seen in AIDS patients. Such treatment elevates neutrophil, lymphocyte, and thrombocyte levels and thereby helps to restore immunocompetence. Because greater susceptibility to infections is a dose- and rate-limiting factor in chemotherapeutic treatment of AIDS patients, treatment of the patients with these compounds reduces chemotherapeutic side effects (and thus improves the quality of life) and permits a more intensive chemotherapeutic regimen to be employed. Treatment of Complications Associated with Cancer Several varieties of cancer are associated with hematological cytopenias independent of those produced by cytoreductive chemotherapy. Hairy cell leukemia is often associated with neutropenia. Neoplastic bone marrow infiltration often impairs hematopoiesis. Administration of the compounds of the invention increases levels of neutrophils and other cell types in those afflicted with such diseases. Some types of granulocytic leukemias are characterized by overproduction of immature, non-differentiating granulocyte precursors. As demonstrated in Examples 35 through 51 below, compounds of the subject invention elicit enhanced terminal differentiation of neutrophil precursors, indicating utility in treatment of leukemias, such as granulocytic leukemia. Use of the Compounds of the Invention in Bone Marrow Transplants Transplantation of the bone marrow is used to treat those suffering the effects of accidental or therapeutic radiation exposure and of cytoreductive chemotherapy (anti-viral and/or anti-neoplastic) . The compounds of the invention are used in a variety of ways to support bone marrow transplantation. Administration of the compounds to bone marrow transplant donors elevates levels of various blood cell types, such a neutrophils, lymphocytes, megakaryocytes, and thrombocyteε (platelets) in peripheral blood and especially their progenitors in the bone marrow itself. Administration of the compounds to bone marrow recipients following, prior to, or during transplantation, accelerates hematopoietic recovery. In addition, incubation of bone marrow cells in culture with the compounds of the invention prior to transplantation improves engraftment potential. Use of the Compounds for Autoloσous Blood Transfusion Autologous blood transfusion, or the intentional storage of quantities of a patient's own blood for subsequent transfusion, e.g. prior to elective surgery or as a precaution for unanticipated situations requiring transfusion, is important in view of the possibility of contamination of blood from other donors with viruses such as HIV or hepatitis viruses. The compounds of the subject invention are useful in restoring blood counts when administered after removal of a patient's blood for storage. Alternatively, th-»se compounds may be administered prior to removal of blood in order to boost cell counts. Prophylactic Use of the Compounds of the Subject Invention There are numerous clinical and veterinary situations in which it is desireable to boost or otherwise modify aspects of the hematopoietic system in anticipation of various challenges. For example, there are many circumstances in which it is beneficial to improve resistance to infection, for example in anticipation of surgical procedures or exposure to viral or bacterial infections. Administration of the compounds of the invention to an animal with normal cell counts increases leukocyte counts and improves host resistance to infection. There are situations in which it is useful to improve an animal's blood-clotting potential, for example before surgery. Administration of the compounds of the invention prior to surgery increases thrombocyte counts and thereby improves the blood-clotting potential. In situations where damage to the bone marrow and/or hematopoietic system is anticipated, such as in anticancer or antiviral chemotherapy or in therapeutic irradiation it is beneficial to improve or enhance hematopoietic function. Pretreatment of an animal scheduled to undergo such therapy with the compounds of the invention accelerates the production of white blood cells and platelets, and/or attenuates damage to blood cell precursors. The compounds positively modify the hematopoietic system prophylactically. Administration of the compounds to bone marrow transplant donors prior to donation elevates levels of various blood cell types, such a neutrophils, lymphocytes, megakaryocytes, and thrombocytes (platelets) in peripheral blood and elevates hematopoietic progenitor cells in the bone marrow itself. D. Administration and Formulation of Compounds and Coapositions of the Invention The compounds and compositions of the invention are administered orally, by parenteral injection, intravenously, topically, or by other means, depending on the condition being treated. The compounds and compositions of the invention are administered chronically or intermittently. The compounds and compositions are administered prior to, during, or after an event (e.g. irradiation or exposure to cytoreductive chemotherapy agents) which causes damage to the hematopoietic system. In the case of after an event, the compounds and compositions are administered before and/or after the nadir in blood cell or bone marrow cell counts is reached. The compounds of the invention are formulated in biodegradable, bioerodible, or other gradual-release matrices for sustained release of the compounds after oral administration or subcutaneous implantation. In the case of intravenous or intramuscular injection, the compounds are optionally formulated in liposomes. The pharmacologically active compounds optionally are combined with suitable pharmaceutically acceptable carriers comprising excipients and auxiliaries which facilitate processing of the active compounds. These are administered as tablets, dragees, capsules, and suppositories. The compositions are administered for example orally, rectally, vaginally, or released through the buccal pouch of the mouth, and may be applied in solution form by injection, orally or by topical administration. The compositions may contain from about 0.1 to 99 percent, preferably from about 50 to 90 percent of the active compound(s), together with the excipient(ε) . For parenteral administration by injection or intravenous infusion, the active compounds are suspended or dissolved in aqueous medium such as sterile water or saline solution. Injectable solutions or suspensions optionally contain a surfactant agent such as polyoxyethylenesorbitan esters, sorbitan esters, polyoxyethylene ethers, or solubilizing agents like propylene glycol or ethanol. The compounds of the invention may are optionally suspended or dissolved in injectable fat emulsions for parenteral administration. The solution or suspension typically contains 0.01 to 5% of the active compounds. The active compounds optionally are dissolved in pharmaceutical grade vegetable oil for intramuscular injection. Such preparations contain about 1 % to 50 % of the active compound(s) in oil. Suitable excipients include fillers such as sugars, for example lactose, sucrose, mannitol or sorbitol, cellulose preparations and/or calcium phosphates, for example tricalcium phosphate or calcium hydrogen phosphate, as well as binders such as starch paste, using, for example, maize starch, wheat starch, rice starch or potato starch, gelatin, tragacanth, methyl cellulose, hydroxypropylmethyl cellulose, sodium carboxymethyl cellulose and/or polyvinyl pyrrolidone. Auxiliaries include flow-regulating agents and lubricants, for example, silica, talc, stearic acid or salts thereof, such as magnesium stearate or calcium stearate and/or polyethylene glycol. Dragee cores are provided with suitable coatings wnich, if desired, are resistant to gastric juices. For this purpose, concentrated sugar solutions are used, which optionally contain gum arabic, talc, polyvinyl pyrrolidone, polyethylene glycol and/or titanium dioxide, lacquer solutions and suitable organic solvents or solvent mixtures. In order to produce coatings resistant to gastric juices, solutions of suitable cellulose preparations such as acetylcellulose phthalate or hydroxypropylmethylcellulose phthalate are used. Dyestuffs or pigments are optionally added to the tablets or dragee coatings, for example, for identification or in order to characterize different compound doses. The pharmaceutical preparations of the present in¬ vention are manufactured in a manner which is itself known, for example, by means of conventional mixing, granulating, dragee- making, dissolving, or lyophilizing processes. Thus, pharmaceutical preparations for oral use are obtained by combining the active compound(s) with solid excipients, optionally grinding the resulting mixture and processing the mixture of granules, after adding suitable auxiliaries, if desired or necessary, to obtain tablets or dragee cores. Other pharmaceutical preparations which are useful for oral delivery include push-fit capsules made of gelatin, as well as soft-sealed capsules made of gelatin and a plasticizer such as glycerol or sorbitol. The push-fit capsules contain the active compound(ε) in the form of granules which optionally are mixed with fillers such as lactose, binders such as starches and/or lubricants such as talc or magnesium stearate, and, optionally stabilizers. In soft capsules, the active compounds are preferably dissolved or suspended in suitable liquids such as fatty oils, liquid paraffin, or polyethylene glycolε. In addition, stabilizers optionally are added. Pharmaceutical preparations which are used rectally include, for example, suppositories which consist of a combination of active compounds with a suppository base. Suitable suppository bases are, for example, natural or synthetic triglycerides, paraffin hydrocarbons, polyethylene glycolε or higher alkanols. In addition, gelatin rectal capsules which consiεt of a combination of the active com¬ pounds with a base are useful. Base materials include, for example, liquid triglycerides, polyethylene glycols, or paraffin hydrocarbons. Suitable formulations for parenteral administration include aqueous solutions of the active compounds in water soluble form, for example, water soluble salts. In addition, suspensions or solutions of the appropriate active compounds in oily injection vehicles, solvents such as propylene glycol, or lipid-aqueous emulsions are administered. Suitable lipophilic solventε or vehicleε include fatty oilε, for example, sesame oil, or synthetic fatty acid esterε, for example, ethyl oleate or triglycerideε. Aqueouε injection suspensions optionally include subεtanceε which increaεe the viεcoεity of the εuspension which include, for example, εodium carboxymethylcelluloεe, sorbitol and/or dextran. The suspenεion optionally contains stabilizers. In another embodiment, the active compounds are formulated as part of a skin lotion for topical administration. Suitable lipophilic solvents or vehicles include fatty oils, for example sesame oil or coconut oil, or synthetic fatty acid esters, for example ethyl oleate or triglycerideε. E. Synthesis of the Coapounds of the Invention Acylated derivatives of oxypurine nucleosides are synthesized by reacting an oxypurine nucleoside or congener with an activated carboxylic acid. An activated carboxylic acid is one that has been treated with appropriate reagents to render its carboxylate carbon more susceptible to nucleophilic attack than is the case in the original carboxylic acid. Examples of useful activated carboxylic acids for synthesis of the compounds of the invention are acid chlorides, acid anhydrideε, n-hydroxysuccinimide esters, or carboxylic acids activated with BOP-DC. Carboxylic acids may also be linked to oxypurine nucleosides or congeners with coupling reagents like dicyclohexylcarbodiimide (DCC) . During preparation of the acyl compounds of the in¬ vention, when the acid source of the desired acyl derivative has groups which interfere with the acylation reactions, e.g., hydroxyl or amino groups, these groups are blocked with pro¬ tecting groups, e.g., t-butyldimethylsilyl ethers or t-BOC groups, respectively, before preparation of the anhydride. For example, lactic acid is converted to 2-t-butyldimethyl- siloxypropionic acid with t-butyldimethylchlorosilane, followed by hydrolysis of the resulting silyl ester with agueous baεe. The anhydride is formed by reacting the protected acid with DCC. With amino acids, the N-t-BOC derivative is prepared, using standard techniques, which is then converted to the anhydride with DCC. With acids containing more than one carboxylate group (e.g., succinic, fumaric, or adipic acid) the acid anhydride of the deεired dicarboxylic acid is reacted with an oxypurine nucleoside or congener in pyridine or pyridine pluε dimethylformamide or dimethylacetamide. Amino acidε are coupled to the exocyclic amino groups of guanosine and deoxyguanosine, and to hydroxyl groups on the aldose moiety of oxypurine nucleosides or their congeners, by standard methods using DCC in a suitable solvent, particularly a mixture of (i) methylene chloride and (ii) dimethylacetamide or dimethylformamide. The following exampleε are illustrative, but not limiting of the methods and compositions of the present invention. Other suitable modifications and adaptations of a variety of conditions and parameters normally encountered in clinical therapy which are obvious to those skilled in the art are within the spirit and scope of this invention. The Examples The following examples relate to methods for preparing the compounds of the subject invention. Exaaple 1: Preparation of Octanoylguanosine To a 100 mL flask was added guanosine (2.0 g, 7.06 romol) and N,N-dimethyl-4-aminopyridine (0.017 g, 0.14 mmol). N,N-dimethylfσrmamide (25 mL) was added via cannula with stirring, the flask was purged with argon gas and pyridine (14 mL) was added via cannula. The slurry was allowed to cool 10 min. in an ice/NaCl bath and octanoyl chloride (1.6 L, 9.2 mmol) was added dropwise. The mixture was allowed to stir while it slowly warmed to 25 °C. After 18 h, the mixture was poured into 300 mL of ice-cold 0.1 M sodium bicarbonate solution giving a white solid which was isolated by suction filtration, washed with 3x100 mL hot water, aii dried, and recrystallized from hot methanol. Exaaple 2: Preparation of Lauroylguanosine To a 100 mL flask was added guanosine (2.0 g, 7.06 mmol) and N,N-dimethyl-4-aminopyridine (0.017 g, 0.14 mmol). N,N-dimethylformamide (25 mL) was added via cannula with stirring, the flask was purged with argon gas and pyridine (14 mL) was added via cannula. The slurry was allowed to cool 10 min. in an ice/NaCl bath and lauroyl chloride (2.12 L, 9.2 mmol) was added dropwise. The mixture was allowed to stir while it slowly warmed to 25 °C. After 18 h, the mixture was poured into 300 mL of ice-cold 0.1 M sodium bicarbonate solution giving a white solid which was isolated by suction filtration, washed with 3x100 mL hot water, air dried, and recrystallized from hot methanol. Exaaple 3; Preparation of Palmitoylguanosine To a 100 mL flaεk was added guanosine (2.0 g, 7.06 mmol) and N,N-dimethyl-4-aminopyridine (0.017 g, 0.14 mmol). N,N-dimethylformamide (25 mL) was added via cannula with stirring, the flask was purged with argon gas and pyridine (14 mL) was added via cannula. The slurry was allowed to cool 10 min. in an ice/NaCl bath and palmitoyl chloride (2.8 mL, 9.2 mmol) was added dropwise. The mixture was allowed to stir while it slowly warmed to 25 °C. After 18 h, the mixture was poured into 300 mL of ice-cold 0.1 M sodium bicarbonate solution giving a white solid which was isolated by suction filtration, waεhed with 3x100 mL hot water, air dried, and recryεtallized from hot 2-methoxyethanol. Exaaple 4: Preparation of Benzoylguanoεine To a 100 mL flaεk was added guanosine (2.0 g, 7.06 mmol) and N,N-dimethyl-4-aminopyridine (0.017 g, 0.14 mmol). N,N-dimethylformamide (30 mL) was added via cannula with stirring, the flask was purged with argon gas and pyridine (16 mL) waε added via cannula. The slurry was allowed to cool 10 min. in an ice/NaCl bath and benzoyl chloride (1.2 mL, 8.5 mmol) was added dropwise. The mixture was allowed to stir while it slowly warmed to 25 °C. After 72 h, the mixture was poured into 300 mL of 0.1 M sodium bicarbonate solution (warmed to 60 °C) giving a white solid which was isolated by suction filtration (using a medium glass frit) , washed with 3x100 mL cold water, and air dried. Exaaple 5: Preparation of Palmitoylxanthosine To a 50 mL flask was added xanthosine dihydrate (1.0 g, 3.52 mmol) and N,N-dimethyl-4-aminopyridine (0.0086 g, 0.07 mmol). N,N-dimethylformamide (16 mL) was added via cannula with stirring, the flask was purged with argon gas and pyridine (8 mL) was added via cannula. The slurry was allowed to cool 10 min. in an ice/NaCl bath and palmitoyl chloride (1.6 mL, 9.2 mmol) was added dropwise. The mixture was allowed to stir while it slowly warmed to 25 °C. After 18 h, the mixture was poured into 300 mL of ice-cold 0.1 M sodium bicarbonate solution giving a white solid which was isolated by suction filtration, washed with 3x100 mL hot water, air dried, and recrystallized from hot methanol. Exaaple 6: Preparation of Palmitoylinosine To a 50 mL flaεk waε added inoεine (1.0 g, 3.73 mmol) and N,N-dimethyl-4-aminopyridine (0.017 g, 0.074 mmol). N,N-dimethylformamide (16 mL) was added via cannula with stirring, the flask was purged with argon gas and pyridine (8 mL) was added via cannula. The slurry was allowed to cool 10 min. in an ice/NaCl bath and palmitoyl chloride (1.3 mL, 4.1 mmol) was added dropwise. The mixture was allowed to stir while it slowly warmed to 25 °C. After 18 h, the mixture was quenched with a small chunk of ice and the solventε were evaporated leaving a white gum. Toluene (20 mL) was evaporated from the gum, which was then thoroughly triturated with 1:1 ethyl acetate-diethyl ether. The supernatant was isolated by suction filtration and the solventε evaporated leaving a εyrup which turned into a εoft, amorphouε εolid after 24 h in a vacuum deεiccator. Exaaple 7: Preparation of Palmitoyldeoxyinoεine To a 100 mL flaεk waε added deoxyinoεine (1.5 g, 5.95 mmol) and N,N-dimethyl-4-aminopyridine (0.036 g, 0.297 mmol). N,N-dimethylformamide (35 mL) waε added via cannula with stirring, the flask was purged with argon gaε and pyridine (15 mL) waε added via cannula. The εlurry waε allowed to cool 10 min. in an ice/NaCl bath and palmitoyl chloride (2.0 mL, 6.54 mmol) waε added dropwiεe. The mixture waε allowed to εtir while it εlowly warmed to 25 β C. After 18 h, the mixture waε poured into 300 mL of ice-cold 0.1 M εodium bicarbonate εolution giving a white solid which was isolated by εuction filtration, waεhed with 100 mL water, and dried overnight in a vacuum deεiccator giving 2.72 g (93%) of palmitoyldeoxyinosine. Exaaple 8: Preparation of (5-carboxypentanoyl)guanosine To 500 mg of guanosine in anhydrouε pyridine waε added adipic acid (5 mol eg) and biε(2-oxo-3-oxazolidinyl)- phoεphinic chloride (BOPDC) (1.0 mol eg.). The mixture was allowed to stir at room temperature for 18 h, then the solvent was removed in vacuo. The residue was added to 100 mL of ice-cooled water and the aqueous layer adjusted to pH 3.0 and then extracted three times with 60 mL of ethyl acetate. The combined extracts are dried over anhydrous magnesium sulfate and evaporated in vacuo. The residue was chromatographed on a silica gel column and eluted with a mixture of chloroform- ethanol, whereupon the eluate was evaporated in vacuo. Exaaples 9-11; Preparation of (5-carboxyhexanoyl)guanosine, (5-carboxy- heptanoyl)guanosine, and (5-carboxynonanoyl)guanosine (5-carboxyhexanoyl)guanosine, (5-carboxyheptanoyl) guanosine, and (5-carboxynonanoyl)guanosine were prepared from guanosine with pimelic acid, εuberic acid, and sebacic acid, respectively, in a manner similar to that used for (5-carboxy- pentanoyl)guanosine. xy l<? !? • Preparation of 3' ,5'-0,0-Bis-(5-carboxypentanoyl) guanosine To 500 mg of guanosine in anhydrouε pyridine was added adipic acid (10 mol eq) and bis(2-oxo-3-oxazolidinyl)- phosphinic chloride (BOPDC) (2.0 mol eq.). The mixture was allowed to stir at room temperature for 18 h, then the solvent was removed in vacuo. The residue was added to 100 mL of ice-cooled water and the aqueous layer adjusted to pH 3.0 and then extracted three timeε with 60 L of ethyl acetate. The combined extractε were dried over anhydrous magnesium sulfate and evaporated in vacuo. The residue was chromatographed on a silica gel column and eluted with a mixture of chloroform- ethanol, whereupon the eluate was evaporated in vacuo. Exaaples 13-15: Preparation of 3' ,5'-0,0-Biε-(5-carboxy- hexanoyl)guanoεine, 3',5'-0,0-Biε-(5-carboxyheptanoyl)guano¬ sine, and 3',5'-0,0-Bis-(5-carboxynonanoyl)guanosine 3',5'-0,0-Bis-(5-carboxyhexanoyl)guanosine, 3',5'- 0,0-Bis-(5-carboxyheptanoyl)guanosine, and 3' ,5'-0,0-Bis-(5- carboxynonanoyl)guanoεine were prepared from guanoεine with pimelic acid, suberic acid, and sebacic acid, respectively, in a manner similar to that used for (5-carboxy- pentanoyl)guanosine. Exaaple 16: Preparation of (Na-FMOC-Ne-CBZ-lysyl)guanosine To 500 mg of guanosine in anhydrouε pyridine waε added Na-FMOC-Ne-CBZ-lyεine (2 mol eq, from Sigma) and dicyclohexylcarbodiimide (DCC) (1.0 mol eq.) The mixture waε allowed to εtir at room temperature for 18 h, then the εolvent waε removed in vacuo. The residue was added to 100 mL of ice-cooled water and the aqueous layer adjusted to pH 3.0 and then extracted three timeε with 60 mL of ethyl acetate. The combined extractε were dried over anhydrous magnesium sulfate and evaporated in vacuo. The residue was chromatographed on a silica gel column and eluted with a mixture of chloroform- ethanol, whereupon the eluate was evaporated in vacuo. 71 Example 17: Preparation of (Nα-FMOC-Ne-CBZ-lysyl)-2' ,3'-0- isopropylideneguanosine To 2.0 g of 2' ,3'-0-isopropylideneguanosine (from Sigma) in anhydrous pyridine was added Nα-FMOC-Ne-CBZ-lysine (2 mol eq, from Sigma) and dicyclohexylcarbodiimide (DCC) (1.0 mol eq.). The mixture was allowed to stir at room temperature for 18h, then the solvent was removed in vacuo. The residue was added to 100ml of ice-cooled water and the aqueous layer adjusted to pH 3.0 and then extracted three times with 60 mL of ethyl acetate. The combined extracts were dried over anhydrous magnesium sulfate and evaporated in vacuo. The residue was chromatographed on a silica gel column and eluted with a mixture of chloroform- ethanol, whereupon the eluate was evaporated in vacuo. Exaaple 18: Preparation of (Nα-FMOC-Ne-CBZ-lysyl)guanosine A solution of 1.5 g of (Nα-FMOC-Ne-CBZ-lysyl)- 2' ,3'-0-isopropylideneguanosine in 18 mL of 50% aqueous HC02H was allowed to stand for 20 hr at room temperature. The εolution was evaporated to dryness giving a residue which was recrystallized from MeOH-EtOAc. Example 19: Preparation of (Nα-FMOC-lysyl)guanoεine A solution of 1.0 g of (Nα-FMOC-Ne-CBZ- lysyl)guanosine in 150 mL of DMF was hydrogenated for 3.5 hr at 48 psi in the presence of 0.7 g of 10% Pd/C. The mixture was filtered and the filtrate evaporated and then treated with 30mL of EtOH followed by 20 mL of H20. The resulting solid was recrystallized from MeOH-EtOAc. Example 20: Preparation of lysylguanosine To a stirred solution of 800 g of (Nα-FMOC- lyεyl)guanoεine in anhydrous pyridine was added anhydrous piperidine (4 mol eq.). The mixture was allowed to stir for 5 hr at 0°C and then waε evaporated to dryneεε. The reεidue waε diεsolved in DMF and purified by slow addition of the DMF solution to a rapidly stirred solution of EtOH-Et20, yielding a precipitate. Exaaple 21: Preparation of Palmitoyl-2'-deoxyguanosine To a 250 mL flask waε added 2'-deoxyguanosine mono- hydrate (5.0 g, 17.5 mmol), triethylamine (3.13 ml, 22.4 mmol) and N,N-dimethyl-4-aminopyridine (0.046 g, 0.37 mmol). N,N- dimethylformamide (130 mL) was added via cannula with stirring and the flask was purged with argon gas. The slurry was allowed to cool 10 minutes in an ice/NaCl bath and palmitoyl chloride (6.3 mL, 20.6 mmol) was added dropwise. The mixture waε allowed to stir while it slowly warmed to 25 degrees C. After 72 h, the mixture was poured with stirring into 400 mL of a 1:1 mixture of water and saturated aqueous sodium bicarbonate solution, which mixture had been warmed to about 60 degrees C. The resulting white solid was iεolated by suction filtration, washed with water, and dried. Example 22: Preparation of 3'-O-Palmitoyl-2'-deoxyguanosine This compound was prepared using the procedure for Palmitoyl-2'-deoxyguanosine, subεtituting the appropriate amount of 5'-O-dimethoxytrityl-deoxyguanosine for 2'- deoxyguanosine monohydrate and deprotecting the 5' hydroxyl group as follows: removing the dimethoxytrityl group by stirring in 80% aqueous acetic acid at 25 degrees C for 1 hour, isolating the crude product by filtration, triturating the crude product for 1 hour in methanol, recovering the product by filtration and drying. Exaaple 23: Preparation of 3,5'-0,0-Dipalmitoyl-2'-deoxy¬ guanosine This compound was obtained as εide product from 5'- O-palmitoyl-2'-deoxyguanosine, as prepared above, and isolated as follows: suεpending the crude product in toluene with silica gel, evaporating the toluene, applying the resulting solid to a column of silica gel capped with a short layer of alumina, eluting the column with chloroform-methanol, and evaporating the appropriate fractions. Exaaple 24: Preparation of octanoyl-2'-deoxyguanosine This compound was prepared using the procedure for palmitoyl-2'-deoxyguanosine, substituting the appropriate amount of octanoyl chloride for palmitoyl chloride. Example 25: Preparation of Lauroyl-2'-deoxyguanosine Thiε compound was prepared using the procedure for palmitoyl-2'-deoxyguanosine, εubstituting the appropriate amount of octanoyl chloride for palmitoyl chloride. Example 26: Preparation of Benzoyl-2'-deoxyguanosine This compound was prepared using the procedure for palmitoyl-2'-deoxyguanoεine, εubstituting the appropriate amount of benzoyl chloride for palmitoyl chloride, and substi¬ tuting a 1:1 mixture of ice water and saturated aqueous sodium bicarbonate solution in the workup. Exaaple 27: Preparation of Butyryl-2'-deoxyguanosine This compound was prepared using the procedure for palmitoyl-2'-deoxyguanoεine, substituting the appropriate amount of butyryl chloride for palmitoyl chloride, and isolating as follows: evaporating the solvent after 72 hours, triturating the resulting material in 1:1 diethyl ether-ethyl acetate, and recovering the product by filtration. Exaaple 28: Preparation of Palmitoyl-8-bromo-2'-deoxyguanosine This compound was prepared uεing the procedure for Palmitoyl-2'-deoxyguanoεine, substituting the appropriate amount of 8-bromoguanosine for 2'-deoxyguanoεine monohydrate. Exaaple 29: Preparation of Palmitoyl-8-mercapto-2'- deoxyguanosine This compound was prepared uεing the procedure for palmitoyl-2'-deoxyguanosine, subεtituting the appropriate amount of 8-mercaptoguanoεine for 2'-deoxyguanoεine monohydrate. Exaaple 30: Preparation of Pal itoylguanoεine 2,3'-acyclic dialcohol Thiε compound waε prepared uεing the procedure for palmitoyl-2'-deoxyguanoεine, substituting the appropriate amount of guanosine 2',3'-acylic dialcohol for 2'- deoxyguanoεine monohydrate. The following examples demonstrate the benefits of the compounds of the invention in vivo. Example 31: Guanosine and guanine improve hematopoietic recovery after cyclophosphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was adminis¬ tered to 30 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter for a total of 6 dayε, mice were given a 0.4 ml i.p. injection of either physiological saline (controls), guanine (5 μmoles/mouεe/day) , or guanoεine (5 μmoleε/mouse/day) . On day 7 all 10 mice in each of the three groups were bled, and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. Treatment with either guanine or guanosine resulted in significantly heavier spleens than in saline-treated controls (Figure 1). Likewise, treatment with guanine or guanosine also resulted in significantly more peripheral total white blood cells and neutrophils (Figures 2 and 3, respectively). Thus, treatment of mice with guanine or guanosine following CP damage clearly accelerates the regeneration of yelopoiesis. Example 32: Effect of guanoεine acyl substituent chain length on hematopoietic recovery after cyclophosphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was ad¬ ministered to 70 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter for a total of 6 days, mice were given a 0.4 ml i.p injection of either physiological εaline (controlε), Tween 80 (0.2%), guanoεine (5 μmoleε/mouse/day in 0.2% Tween 80), or 2.5 μmoles per mouse per day of one of the following acylated derivatives of guanoεine in 0.2% Tween 80: triacetylguanosine, octanoylguanosine, lauroylguanosine, or palmitoylguanoεine. On day 7 following CP adminiεtration all 10 ani alε from each of the 7 groups were bled, and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood counts performed. No significant difference in spleen weight was εeen between the groupε treated with εaline, Tween 80, or non- acylated guanoεine. However, treatment of mice with acetylguanoεine, octanoylguanoεine, laurolyguanoεine, or palmitoylguanosine resulted in significantly larger spleens on day 7 compared to the controlε (Figure 4) . Treatment with any and all of theεe compoundε reεulted in significantly elevated white blood cell (WBC) counts. However, the greater the chain length of the acyl group, the greater the effect on WBC count within the εelection of compounds tested in this experiment. In this experiment, treatment with palmitoylguanosine had the greatest effect on total WBC counts (Figure 5); a similar relationship between acyl radical chain length and amplitude of hematopoietic responεe waε alεo observed with total neutro¬ phil counts (Figure 6). Example 33: Palmitoylguanosine improveε survival of irradiated mice Thirty female Balb/C mice weighing 20 grams each were irradiated with Cobalt 60 gamma radiation at a dose rate of 7.3 Rads per minute. The total dose was either 700, 725, or 750 Rads. Twenty-four hours later and each day thereafter for a total of 6 dayε, these mice received an i.p. injection of either physiological saline (controls) or 50 mg/kg of palmitoylguanosine. The number of animals surviving in each group was observed over a 30 day period. As is shown in Table 1, all of the irradiated mice treated with saline died during the 30 day observation period, even at the lowest radiation dose. In marked contraεt, all of the mice treated with palmitoylguanoεine survived. (Mice treated with palmitoylguanosine were only tested at the 2 higher doses of radiation.) Therefore, treatment of mice with palmitoylguanosine following irradiation dramatically increaseε survival. Pretreatment of mice with palmitoylguanosine prior to irradiation also improved survival. 78 Table 1 Radiation Dose Treatment 700 R 725 R 750 R Saline (control) 0/10 0/5 0/5 Palmitoylguanosine 5/5 5/5 Values indicate number of mice surviving 30 days after irradiation over number of mice irradiated. Exaaple 34: Palmitoylguanosine increaεeε colony forming units in bone marrow of mice recovering from cyclophosphamide treatment Seventy-two Balb/C female mice weighing approximately 20 grams each were given cyclophoεphamide (275 mg/kg) by intraperitoneal (i.p.) injection. Twenty-four hourε later and each day thereafter, mice received a 0.4 ml i.p. injection of either phyεiological εaline (control) or palmitoylguanosine (2.5 μmoles/mouse/day in 0.2% Tween 80). On dayε 3, 5, 7, and 10 following CP adminiεtration 6 animals from each group were sacrificed by cervical dislocation, and the left femur of each animal obtained by sterile means. The » bone marrow cellε were then fluεhed from the femurε with McCo 'ε 5a Modified medium uεing a 23-gauge needle. Cellε from femurε in the εame group were pooled, diεperεed by briefly vortexing, and counted uεing a hemocytometer. Cell suspensionε were added to McCoy'ε Modified 5a medium containing 15% bovine calf εerum, lx Kanamycin, 0.3% agar, and 3% endotoxin-εtimulated εerum. The suspensions were then plated at a density of 1.2 x 10 5 cells/ml, except on day 3 when, due to lower cell counts at that time point, the plating density was 1.0 x 10 5 . Each group was plated in quintuplicate. After 7 days in culture (at 37° in 5% C0 2 and humidified air) aggregates of 50 cells or more ("colonies") were counted using a dissecting microscope at 25x. At each time point the number of colonies observed per femur from the palmitoylguanosine-treated mice waε significantly greater than the number from the saline-treated group (Figure 7 and Table 2. The greatest difference between the groups was seen on day 5. Table 2 Day 3 Day 5 Day 7 Day 10 Saline (control) 460±22 714±63 949+61 253±18 Palmitoylguanosine 645±26 2327 121 1328±140 647125 Values indicate number of colony-forming unitε per femur in mice at variouε timeε after administration of cyclophosphamide 92/13561 Example 35: Effect of timing of palmitoylguanosine administration on hematopoietic recovery after cyclophosphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was ad¬ ministered to 81 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later treatment waε begun. Mice were given a 0.4 ml i.p. injection of either physiological saline (controls), Tween 80 (0.2%), or palmitoylguanosine (5 μmoles/mouse/day in 0.2% Tween 80). The timing of the treatments was varied within the groups. The control group was given saline on days 1-6. The mice receiving Tween 80 were treated either on days 1-4, 4-6 or 1-6. Palmitoylguanosine-treated mice were treated either on days 1-2, 1-4, 3-5, 4-6 or 1-6. If a group of mice received no Tween 80 or palmitoylguanosine on a given day, saline was administered by i.p. injection. Thus, there were 9 groups of 9 animals in all. On day 7 following CP administration all of the animals were bled and then sacrificed by cervical dis¬ location. Spleens were removed and weighed, and complete blood cell counts performed. Spleen weight was elevated compared to saline controls in all of the treatment groups except thoεe receiving Tween 80 on dayε 1-4 only (Figure 8). Administration of palmitoylguanosine for any of the time periods tested, including only treating on days 1 and 2, resulted in significantly greater spleen weight compared to the controlε (also Figure 8). In addition, treatment with palmitoylguanosine (for any period of time) resulted in larger spleens than in mice treated only with Tween 80. Treatment 81 with palmitoylguanosine on days 1-4 or 1-6 had the greatest effect on spleen weight. Total white blood cell (WBC) counts were significantly greater in each of the groups receiving palmitoylyguanosine than in saline controls (Figure 9). Further, WBC counts from all of the palmitoylguanosine-treated mice, except those treated only on days 4-6, were significantly greater than in mice treated with Tween 80 for any period of time. The greatest effect was seen in mice treated on days 1-6 with palmitoylguanosine. The number of WBC counts in this group was also significantly greater than any of the other palmitoylguanosine-treated groups. The pattern of results relative to WBC's was mirrored by the neutrophil data (Figure 10), in which treatment with palmitoylguanosine on days 1-6 resulted in the greatest increase in total neutrophil counts. Treatment with palmitoylguanosine on only days 1 and 2 caused a significant increase in total neutrophils compared to either saline controls or Tween 80-treated mice. Lymphocyte counts were not affected by treatment with Tween 80 (or saline) for any period of time. Only treatment with palmitoylguanosine on days 1-2 or 1-6 (again the greatest effect) resulted in elevated lymphocyte counts (Figure 11). ■EXflffP-te 36: Palmitoylguanosine improves hematopoietic recovery after 5-fluorouracil 5-fluorouracil (5-FU) (150 mg/kg, i.p.) was ad¬ ministered to forty Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day therea er for a total of 8 days, mice were given a 0.4 ml i.p. injection of either physiological saline (controls) or 5'-0-palmitoylguanoεine (2.5 μmoleε/mouεe/day in 0.2% Tween 80). On days 7 and 14 following 5-FU administration half of the animals from each group were bled and then were sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cells countε performed. On day 7 a εlight, but statistically significant, increaεe in spleen weight was observed in the group treated with palmitoylguanosine (Figure 12). No other differences were εeen between control and treated animalε on day 7. On day 14, however, thoεe animalε that received palmitoylguanoεine had εignificantly higher numberε of total leukocytes, lymphocytes, neutrophils, and platelets, in addition to having significantly heavier spleenε (Figureε 13-15). Exaaple 37: Palmitoylguanoεine improveε hematopoietic recovery after 5-fluorouracil 5-fluorouracil (5-FU) (150 mg/kg,i.p.) was adminiεtered to fifty-four Balb/C female mice weighing approximately 20 gramε each. Twenty-four hourε later and each day thereafter for a total of 7 dayε, mice were given a 0.4 ml i.p. injection of either physiological saline (controls) or palmitoylguanosine (2.5 μmoles/mouεe/day in 0.2% Tween 80). On dayε 8, 10 and 12 following administration of 5-FU nine animals from each group were bled and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. On day 8 the number of platelets in the blood samples from the mice treated with palmitoylguanosine was significantly greater than the number in the control group (Figure 16). No other statiεtically significant differences between the groups were seen on day 8. On day 10, in addition to greater numbers of platelets in the treated group, the spleens from the mice receiving palmitoylguanosine were alεo significantly larger than those receiving only saline (Figure 17). On day 12, the spleen weight of the animals in the treated group was more than double that of the control mice, and the number of neutrophils in the blood of the treated group was 3-fold greater than in the control samples (Figures 17 and 18). The white blood cell count is also shown (Figure 19). Exaaple 38: Palmitoyldeoxyinosine and palmitoylguanosine enhance he atopoiesiε in normal mice Normal, otherwise untreated, female Balb/C mice weighing approximately 20 grams each received a total of 4 or 9 0.4 ml intraperitoneal injections (one per day) of either Tween-80 (0.2%) (controls), palmitoylguanosine (2.5 μmoles/mouse/day) , or pal itoyldeoxyinoεine (2.5 μmoleε/mouεe/day). Twenty-four hourε after the 4th or 9th treatment, groups of 5 or 6 animals from each of the 3 groups were bled and then sacrificed by cervical dislocation. Spleenε were removed and weighed, and complete blood cell countε performed. Spleen weightε on day 5 were εignificantly greater in the mice treated with palmitoylguanosine and palmitoyldeoxyinosine than in those treated with saline (Figure 20). On day 10, spleen weights, total leukocyte countε, and neutrophil countε were all significantly greater in the mice treated with palmitoyldeoxyinosine than in the Tween 80 controls (Figures 20-22). Total leukocyte counts were also significantly elevated compared to controls in the mice treated with palmitoylguanosine. Exaaple 39: Dose-response for octanoylguanosine in improving hematopoietic recovery after cyclophosphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was ad¬ ministered to 45 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter for a total of 6 dayε, mice were given a 0.4 ml i.p. injection of either phyεiological εaline (controlε), Tween 80 (0.5%), or one of three different doεeε of octanoylguanosine (0.5, 2.5, or 5 μmoles/mouεe/day in 0.5% Tween 80). On day 7 following CP administration all 9 animals from each of the 5 groups were bled and then sacrificed by cervical dislocation. Spleenε were removed and weighed, and complete blood cell counts performed. Treatment of these CP-compromised mice with Tween 80 reεulted in εo e increaεe in the mean spleen weight, but treatment with octanoylguanosine at each of the three doses tested resulted in significantly larger spleens than in controls and larger than in Tween 80-treated mice (Figure 23). Mice treated with the highest dose of octanoylguanosine (10 μmoleε) had the largeεt εpleens (data not εhown). More importantly, the total number of leukocyteε and the total number of neutrophilε waε significantly increased above control values in a dose-dependent manner (Figures 24 and 25). The middle dose of octanoylguanosine (2.5 μmoles) was, however, nearly as effective as the highest dose in accelerating the regeneration of hematopoiesiε. Exaaple 40: Histological examination of spleenε from mice treated with octanoylguanσεine after cyclophoεphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was ad¬ ministered to 30 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter for a total of 6 days, mice were given a 0.4 ml i.p. injection of either physiological saline (controls), Tween 80 (0.5%), or octanoylguanosine (5.0 μmoles/mouse/day in 0.5% Tween 80). On day 7 following CP administration all 10 animals from each of the 3 groups were bled and then sacrificed by cervical dislocation. Spleens were removed, weighed, and fixed in 10% formalin for later histological examination. Complete blood cell counts were performed on the collected blood. Treatment of mice with Tween 80 alone resulted in a modest increase in spleen weight compared to saline-treated controls. However, treatment with octanoylguanosine resulted in spleen weights significantly greater than those in either saline-treated controls or Tween 80-treated mice (Figure 26). Histological examination of the spleens revealed histologically normal tiεεue in all treatment groups and much greater lymphopoiesis (increased white pulp) and myelopoiesiε (increased red pulp) in the spleens of the octanoylguanoεine- treated mice compared to the saline-treated controlε and thoεe treated with Tween 80 (Figure 27). Theεe obεervationε indicate that octanoylguanoεine treatment of CP-compromiεed mice accelerateε both myelopoiesis and lymphopoiesis, at least at the level of the spleen. Treatment of mice with octanoylguanosine also clearly resulted in significantly greater numbers of peripheral white blood cellε (WBC) and neutrophilε than εeen in either control or Tween 80-treated mice (Figureε 28 and 29, reεpectively) . pvan le 41: Benzoylguanoεine improveε hematopoietic recovery after cyclophoεphamide Cyclophoεphamide (CP) (275 mg/kg, i.p.) waε adminiε¬ tered to 48 Balb/C female mice weighing approximately 20 gramε each. Twenty-four hourε later and each day thereafter for a total of 6 dayε, mice were given a 0.4 ml i.p. injection of either phyεiological εaline (controlε), benzoylguanoεine (2.5 μmoleε/mouse/day in 0.2% Tween 80), or palmitoylguanosine (2.5 μmoles/mouse/day in 0.2% Tween 80). On days 7 and 10 following CP administration 8 animals from each of the 3 groupε were bled and then were εacrificed by cervical diεlocation. Spleenε were removed and weighed, and complete blood cell countε performed. On day 7 total white blood cellε, neutrophilε, and spleen weight were significantly elevated compared to controls in both the benzoylguanosine-treated and palmitoylguanosine- treated mice (Figures 30-32, respectively). There were no statistically significant differences between these two treatment groups. On day 10 platelet number in both of the acylated guanosine groups was significantly greater than in the control group (Figure 33). Example 42: Palmitoylxanthosine and palmitoyldeoxyinosine improve hematopoietic recovery after cyclophosphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was ad¬ ministered to 36 Balb/C female mice weighing approximately 20 grams each. Twenty four hours later and each day thereafter for a total of 4 or 6 days, mice were given a 0.4 ml i.p. injection of either physiological saline (controls), palmitoyldeoxyinosine (2.5 μmoles/mouse), or palmitoyl¬ xanthosine (2.5 μmoles/mouse). On days 5 and 7 following CP adminiεtration 6 of the 12 animalε in each of the 3 groups were bled and then sacrificed by cervical dislocation. Spleenε were removed and weighed, and complete blood cell countε performed. Spleen weight, total leukocyte counts, and neutrophil counts were significantly elevated at day 5 in the group treated with palmitoyldeoxyinosine compared to controlε (Figureε 34, 35, and 36, reεpectively) . Total leukocyte counts and neutrophil counts were significantly elevated compared to those in mice treated with palmitoylxanthosine as well at this time point. On day 7 following CP administration spleen weight, total leukocytes, and neutrophils were significantly increased compared to controls in both the palmitoylxanthosine-treated and palmitoyldeoxyinoεine-treated groups (Figureε 34, 35, and 36). Exaaple 43: Palmitoylinoεine improveε hematopoietic recovery after cyclophosphamide Cyclophoεphamide (CP) (275 mg/kg, i.p.) waε ad¬ ministered to 48 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter for a total of 6 days, mice were given a 0.4 ml i.p. injection of either physiological saline (controls), octanoylguanosine (2.5 μmoles/mouse), lauroylguanosine (2.5 μmoles/mouse), palmitoylguanosine (2.5 μmoleε/mouεe) , palmitoylinoεine (2.5 μmoles/mouse), or palmitoylxanthosine (2.5 μmoles/mouse). On day 7 following CP adminiεtration the 8 animalε in each of the 6 groupε were bled and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell countε performed. Spleen weight, total leukocyte countε, and neutrophil countε were significantly elevated in each of the 5 treatment groups compared to controls (Figures 37, 38, and 39, respectively). No statiεtically εignificant differenceε were seen comparing the five treatment groups at this time point. Exaaple 44: Acyl derivatives of oxypurine nucleoεide congenerε improve hematopoietic recovery after cyclophosphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was adminiεtered to 96 Balb/C female mice weighing approximately 20 gramε each. Twenty-four hourε later and each day thereafter mice were given a 0.4 ml i.p. injection of either Tween-80 (0.2%) (controlε), palmitoyldeoxyguanoεine (2 μmoles/mouse) , palmitoyldeoxyinosine (2 μmoleε/mouεe), palmitoylacyclovir (2 μmoles/mouse), palmitoylarabinosylguanine (2 μmoleε/mouεe) , palmitoylarabinoεylhypoxanthine (2 μmoleε/mouεe), monopalmitoylguanosine 2' ,3'-acyclic dialcohol (2 μmoleε/mouεe) , and palmitoyl-8-thioguanoεine (2 μmoles/mouse). On days 5 and 7 following CP administration 6 animals in each of the 8 groupε were bled and then εacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. The total neutrophil counts were significantly elevated compared to controlε on dayε 5 and 7 in all 8 treatment groupε (Figure 40*) . The white blood cell count was significantly elevated compared to controls in all but one treatment group (1-0- palmitoylacyclovir) on day 5 and in all 8 treatment groups on day 7 (Figure 41). Spleen weight was significantly elevated compared to controls on day 5 in the following groups: monopalmitoylguanosine 2' ,3'-acyclic dialcohol, palmitoyldeoxyinosine, palmitoylguanosine. It was significantly elevated on day 7 in all treatment groups except palmitoylarabinosylguanine and palmitoylarabmcjylhypoxanthine (Figure 42) . * in all three figures associated with this example the following abbreviations are used: Tw = Tween-80 ACV = palmitoylacyclovir AHx = palmitoylarabmosylhypoxanthme 8TG = palmitoyl-8-thioguanoεine PdG = palmitoyldeoxyguanosine AG = palmitoylarabinoεylguanine dl = palmitoyldeoxyinosine ACG = monopalmitoylguanosine 2' ,3'-acyclic dialcohol Eχ»»pi<=> A - Acyl derivatives of deoxyguanosine improve hematopoietic recovery after cyclophoεphamide Cyclophoεphamide (CP) (275 mg/kg, i.p.) waε adminiεtered to 88 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter mice were given a 0.4 ml i.p. injection of either Tween-80 (0.2%) (controls), 3'-O-palmitoyldeoxyguanosine (2 μmoles/mouse), butyryldeoxyguanosine (2 μmoles/mouse), palmitoyl-N- isobutyryldeoxyguanosine (2 μmoleε/mouεe), lauryldeoxyguanoεine (2 μmoles/mouse), octanoyldeoxyguanosine (2 μmoles/mouse), and palmitoyldeoxyguanosine (2 μmoleε/mouεe). On days 5 and 7 following CP administration 6 or 7 animals in each of the 7 groups were bled and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. Spleen weight and total neutrophil counts were significantly elevated compared to controls on day 5 in the following groups: 3'-0-palmitoyldeoxyguanosine, palmitoyl-N- isobutyryldeoxyguanosine, and palmitoyldeoxyguanosine (Figureε 43 and 44). On day 7 εpleen weight and total neutrophil countε were significantly elevated relative to controls in all of the treatment groupε. White blood cell counts were significantly elevated on day 5 in the palmitoyldeoxyguanosine groups. On day 7 white blood cell counts were significantly elevated compared to controls in all of the treatment groups (Figure 45). Example 46: Dose-response characteristics of palmitoyldeoxyguanosine in improving hematopoietic recovery after cyclophosphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was administered to 85 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter mice were given a 0.4 ml i.p. injection of either physiological saline (controls), or palmitoyldeoxyguanosine at one of four different doses: 0.2, 0.4, 1.0 or 2.0 μmoles/mouse) . On days 5 and 7 following CP administration 9 and 8 animals, respectively, in each of the 5 groups were bled and then εacrificed by cervical diεlocation. Spleenε were removed and weighed, and complete blood cell countε performed. Spleen weight, white blood cell countε, and total neutrophil counts were significantly elevated compared to controls on day 5 and day 7 in all 4 of the treatment groups except at the lowest dose (0.2) of palmitoyldeoxyguanosine on day 5 (Figures 46, 47, and 48). A clear doεe-reεponse trend was seen, with increasing doseε yielding heavier spleens and greater cell counts. Exaaple 47: Comparative dose-responεe characteriεticε of palmitoyldeoxyguanosine and palmitoylguanosine in improving hematopoietic recovery after cyclophoεphamide Cyclophoεphamide (CP) (275 mg/kg, i.p.) waε adminiεtered to 96 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter mice were given a 0.4 ml i.p. injection of either physiological saline (controls), palmitoylguanosine at one of four different doseε: 0.2, 0.4, 1.0 or 2.0 μmoles/mouse) , or palmitoyldeoxyguanosine at a dose of 1.0 μmoleε/mouεe. On dayε 5 and 7 following CP adminiεtration 8 animals from each of the 6 groups were bled and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell countε performed. Spleen weight, white blood cell countε, and total neutrophil countε were εignificantly elevated compared to controlε on day 5 at the higheεt teεted doεe (2.0 μmoleε/mouεe) of palmitoylguanoεine and in the palmitoyldeoxyguanoεine group (Figureε 49, 50, and 51). Palmitoylguanosine at a dose of 1.0 μmoles/mouse also significantly increased total neutrophil counts on day 5. On day 7 spleen weight, white blood cell countε, and total neutrophil counts were significantly elevated compared to controlε in the groupε receiving 1.0 and 2.0 μmoleε/mouεe of palmitoylguanoεine and in the palmitoyldeoxyguanoεine group. A clear doεe-reεponεe trend waε εeen, with increaεing doses of palmitolyguanosine yielding heavier spleens and greater cell counts. Palmitoyldeoxyguanosine appeared to be more potent in elevating these parameterε than the εame or even a 2-fold greater dose of palmitoylguanosine. Example 48: Dose-reεponse characteristics of palmitoyldeoxyguanosine in improving hematopoietic recovery after cyclophosphamide Cyclophosphamide (CP) (275 mg/kg, i.p.) was administered to 112 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter mice were given a 0.4 ml i.p. injection of either physiological saline (controls), or palmitoyldeoxyguanosine at one of six different doses: 0.04, 0.08, 0.2, 0.4, 0.6 or 0.8 μmoles/mouse. On days 5 and 7 following CP administration 8 animals from each of the 7 groups were bled and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. Spleen weight was εignificantly elevated compared to controls on day 5 in all of the palmitoyldeoxyguanosine groups receiving doseε of 0.2 μmoles/mouse or greater, and on day 7 in all of the groups except those receiving a dose of only 0.04 μmoles/mouse (Figure 52). White blood cell counts were significantly elevated compared to controls on day 5 in all of the palmitoyldeoxyguanoεine groupε receiving doεeε of 0.4 μmoleε/mouεe or greater (Figure 53). On day 7 εtatiεtically significant differences were seen at all doseε. Total neutrophil countε were εignificantly elevated relative to controls on both days 5 and 7 at all 6 doses tested (Figure 54). A clear dose-responεe relationship was seen, with increasing doses yielding heavier spleenε and greater cell countε. Example 49: Palmitoyldeoxyguanosine improves recovery of neutrophil, platelet, and lymphocyte counts in rats after cyclophosphamide Cyclophosphamide (CP) (40 mg/kg, i.p.) was administered to 16 F344 male rats weighing approximately 200 grams each. Twenty-four hours later and each day thereafter rats were given a 0.5 ml i.p. injection of either physiological saline (controls), or palmitoyldeoxyguanosine at a dose of 10 μmoles/rat. On days 5, 7 and 10 following CP administration all 8 animals from both groups were bled and complete blood cell counts performed. On day 10 all of the ratε were sacrificed and their spleens removed and weighed. White blood cell counts and total neutrophil counts were significantly elevated in the palmitoyldeoxyguanosine-treated ratε compared to those in saline controls at all three time pointε (Figureε 55 and 56). Plateletε and lymphocyteε were significantly elevated at day 10 in the palmitoyldeoxyguanosine treated group (Figureε 57 and 58). Spleen weight of the treated ratε waε significantly elevated compared to controls. These resultε in ratε confirm and extend the above-noted findings in mice that acylated derivatives of the purine nucleosideε dramatically improve hematopoietic recovery following chemical damage. Particularly notable in thiε experiment iε the perεiεtence of increaεed leukocyte counts after discontinuation of treatment with palmitoyldeoxyguanosine. Example 50: Acyl derivatives of oxypurine nucleoside congeners enhance hematopoiesiε in normal mice Normal Balb/C female mice weighing approximately 20 gramε each were given a daily 0.4 ml i.p. injection of either physiological saline (controls), palmitoylguanosine (2.6 μmoles/mouse), palmitoyldeoxyguanosine (2.6 μmoles/mouse), monopalmitoylguanosine 2' ,3'-acyclic dialcohol (2.6 μmoleε/mouεe) , and palmitoyl-8-bromoguanoεine (2.6 μmoles/mouse) for 4 days. On the fifth day all 3 animals in each of the 5 groups were bled and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. Femoral bone marrow from each mouse was collected and a differential cell count performed on marrow smearε. In each of the figures associated with this example (59-61) the following abbreviations are uεed: P8BG = palmitoyl-8-bromoguanosine PG-C1 = monopalmitoylguanosine 2' ,3'-acyclic dialcohol PG = palmitoylguanosine PdG = palmitoyldeoxyguanosine Spleen weight was significantly elevated compared to controls in the following groups: palmitoylguanosine 2' ,3'- acyclic dialcohol, palmitoyldeoxyguanosine, and palmitoylguanosine (Figure 59). Platelet counts were significantly elevated in the all of the treatment groups except palmitoylguanoεine 2' ,3'-acyclic dialcohol (Figure 60). The number of myelocytes (obligatory neutrophil precurεorε) was also significantly greater than controls in the monopalmitoylguanosine 2',3'-acyclic dialcohol, palmitoyldeoxyguanoεine, and palmitoyl-8-bromoguanoεine groupε (Figure 61). These results show the efficacy of several of the specified compounds in positively modifying hematopoiesis in normal animals. The evidence clearly shows that these compounds are effective at the level of the bone marrow. Exaaple 51 : Pretreatment of mice with palmitoyldeoxyguanosine improves hematopoietic recovery from fluorouracil Twenty-eight female Balb/C mice weighing approximately 20 grams each received a 0.4 ml i.p. injection of either phyεiological saline (controls), or palmitoyldeoxyguanosine (1 μmole/mouεe) daily for three dayε. On the fourth day 5-flourouracil (5-FU) (150 mg/kg, i.p.) waε adminiεtered to all 28 of the animalε. On dayε 5, 8 and 11 following 5-FU administration 4 (day 5) or 5 (days 8 and 11) animals from both groups were bled and then sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. On day 5 platelet counts were significantly elevated in the treated group compared to thoεe in the control group. On day 8 εpleen weight, platelet countε, and total neutrophil countε were εignificantly higher in the group pre-treated with palmitoyldeoxyguanosine. On day 11 those animals pre-treated with palmitoyldeoxyguanosine had εignificantly higher εpleen weights, total white blood cell counts, platelet counts, total neutrophil counts and lymphocyte counts compared to the saline controls (Figures 62, 63, 64, and 65). These resultε show that pretreatment of an animal with palmitoyldeoxyguanosine dramatically ameliorates the effects of 5-FU on the immune syεtem and blood cell countε. Exaaple 52: Tween 80 enhanceε hematopoietic recovery after cyclophoεphamide and enhanceε effect of octanoylguanoεine Cyclophoεphamide (CP) (275 mg/kg, i.p.) was ad¬ ministered to 45 Balb/C female mice weighing approximately 20 grams each. Twenty-four hours later and each day thereafter for a total of 6 days, mice were divided into seven groups and given a 0.4 ml i.p. injection of either physiological saline (controls), Tween 80 at each of three concentrations (0.02%, 0.2% and 1%) or octanoylguanosine (50 mg/kg/dose) in three different concentrationε of Tween 80 (0.02%, 0.2% and 1%). On day 7 following CP adminiεtration all 9 animalε from each of the 5 groupε were bled and then εacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. Seven days after administration of cyclophosphamide, neutrophil counts were elevated in all of the treatment groups compared to mice that received saline alone af er cyclophosphamide, and were significantly different from controls in those mice treated with 1.0% Tween alone, and with octanoylguanosine in 0.02% and 0.2% Tween 80 (Figure 66). Neutrophil countε in animalε receiving 50 mg/kg octanoylguanosine in 0.2% Tween 80 were significantly higher than in animalε receiving the same doεe of octanoylguanosine in 0.02% Tween 80. A variety of other nonionic εurfactantε, including Tween 20, Tween 40, Nonidet P-40, Brij 96, Triton X-100, alεo enhanced the recovery of blood cell countε in mice treated with cyclophosphamide. Exaaple 53: Palmitoyl-8-aminoguanosine enhances hematopoietic recovery after cyclophoεphamide Cyclophoεphamide (CP) (275 mg/kg, i.p.) waε adminiε- tered to 28 Balb/C female mice weighing approximately 20 gramε each. Twenty-four hourε later and each day for 4 days thereafter, mice were given a 0.4 ml i.p. injection of either physiological saline (controls) or palmitoyl-8-aminoguanosine (25 mg/kg/day in 0.2% Tween 80). On dayε 5 and 7 following CP adminiεtration 7 animalε from each of the 2 groups were bled and then were sacrificed by cervical dislocation. Spleens were removed and weighed, and complete blood cell counts performed. On days 5 and 7, neutrophils, and spleen weight were significantly elevated compared to controls in the mice treated with palmitoyl-8-aminoguanosine (Figureε 67-68, reεpectively). The foregoing iε intended aε illustrative of the present invention but not limiting. Numerous variations and modifications may be effected without departing from the true spirit and scope of the invention.

Claims: WHAT IS CLAIMED IS: 1. A compound having the formula wherein R A , R ^ , and R- are the εame, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 6 to 22 carbon atomε , b. an amino acid selected from the group consiεting of glycine, the L formε of alanine, valine, leucine, iεoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and R c is hydrogen or an acyl group derived from i. an unbranched fatty acid with 3 to 22 carbon atoms, ii. an amino acid selected from the group conεisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, εerine, threonine, cyεteine, aεpartic acid, glutamic acid, arginine, lyεine, histidine and ornithine, iii. a dicarboxylic acid having 3-22 carbon atoms , iv. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, v. a nicotinic acid, or vi. a substituted or unsubstituted aromatic carboxylic acid with 7 to 22 carbon atoms, and J = H or NHR- where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. 2. A compound having the formula wherein R A iε hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atomε, b. a dicarboxylic acid having 3-22 carbon atomε, c. nicotinic acid or d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atomε; and wherein R B and/or R D are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and Q = H, a halogen, NHR F where R p is H or an acyl or alkyl radical containing 1 to 10 carbon atomε, S divalently bound to the carbon in which caεe the adjacent carbon-nitrogen double bond iε a ingle bond and an H is then attached to that nitrogen, SR-. where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; or a pharmaceutically acceptable salt thereof. 3. A compound having the formula wherein R A , R,,, and - are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and Q = H, a halogen, NHR r where R F is H or an acyl or alkyl radical containing l to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR-. where R G is .H or an acyl or alkyl radical containing 1 to 10 carbon atomε, O divalently bound to the carbon, in which caεe the adjacent carbon-nitrogen double bond 103 is a single bond and an H is then attached to that nitrogen, or OR H where R H is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; or a pharmaceutically acceptable salt thereof. 4. A compound having the formula wherein R A and R B are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consiεting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that at least one of R A and R B iε not hydrogen, and Q = H, a halogen, NHR F where R F is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which caεe the adjacent carbon-nitrogen double bond iε a single bond and an H is then attached to that nitrogen, or OR,, where R., is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; or a pharmaceutically acceptable εalt thereof. 5. A compound having the formula: wherein R A , R n , and R c may be the same or different, and each iε hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atomε, b. an amino acid εelected from the group conεisting of glycine, the L forms of alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine, phenylalanine, and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, 92/13561 105 e. nicotinic acid provided that not all of R A , R„, and R c are hydrogen; and where R c is not H, then R A and/or R B may also be acetyl, and J = H or NHR, where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof. 6. A compound having the formula: wherein R A and R„ are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that at least one of R A and R B is not hydrogen, and 106 Q = H, a halogen, NHR r where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R c is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, O divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; or a pharmaceutically acceptable salt thereof. 7. A compound having the formula: wherein R A , R B , and R D are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, * serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atomε, nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R n are hydrogen, and Q = H, a halogen, NHR r where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR-. where R c is H or an acyl or alkyl radical containing 1 to 10 carbon atomε, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R,, is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and Z is H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, or a pharmaceutically acceptable salt thereof. 8. A pharmaceutical compound selected from one of the groups of compounds having the formulae: wherein R A , R,,, and R j , are the same, or different, and are hydrogen or an acyl group derived from 108 a. an unbranched fatty acid with 6 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and R c is hydrogen or an acyl group derived from i. an unbranched fatty acid with 3 to 22 carbon atoms, ii. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, iii. a dicarboxylic acid having 3-22 carbon atoms, iv. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, v. a nicotinic acid, or vi. a substituted or unsubstituted aromatic carboxylic acid with 7 to 22 carbon atoms, and J = H or NHR j where R τ is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof; wherein R A is hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. a dicarboxylic acid having 3-22 carbon atoms, c. nicotinic acid or d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms; and wherein R B and/or R D are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atomε, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R„, and R D are hydrogen, and Q = H, a halogen, NHR,. where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, O divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R,. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; or a pharmaceutically acceptable salt thereof; wherein R A , R,., and ^ are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, iεoleucine, tyrosine, proline, hydroxyproline, εerine, threonine, cyεteine, aεpartic acid, glutamic acid, arginine, lyεine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R M , and R n are hydrogen, and Q = H, a halogen, NHR F where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which caεe the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R,, is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; or a pharmaceutically acceptable salt thereof; wherein R A and R„ are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, 112 leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that at least one of R A and R n is not hydrogen, and = H, a halogen, NHR F where R F is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nirrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R 0 is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; or a pharmaceutically acceptable salt thereof; wherein R A , R.., and R c may be the same or different, and each is hydrogen or an acyl group derived from 113 a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine, phenylalanine, and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, e. nicotinic acid provided that not all of R A , R„, and R c are hydrogen; and where R c is not H, then R A and/or R n may also be acetyl, and J = H or NHR- where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, or a pharmaceutically acceptable salt thereof; wherein R A and R B are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, 92/135 1 114 serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that at leaεt one of R A and R B iε not hydrogen, and Q = H, a halogen, NHR F where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R c is H or an acyl or alkyl radical containing 1 to io carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atomε; or a pharmaceutically acceptable salt thereof; wherein R A , ,,, and ^ are the same, or different, and are hydrogen or an acyl group derived from a. an unbranched fatty acid with 3 to 22 carbon atomε, 115 D . an amino acid εelected from the group conεiεting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms, provided that not all of R A , R B , and R D are hydrogen, and = H, a halogen, NHR F . where R F iε H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G iε H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R,, is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and Z is H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, or a pharmaceutically acceptable salt thereof. 9. A pharmaceutical composition comprising a compound as in claim 8 and an antineoplastic agent, an antiviral agent, or other agent which decreases blood cell counts. 10. A pharmaceutical composition comprising a compound aε in claim 8 and erythropoietin, a colony stimulating factor, an interleukin, or other agent which increases blood cell counts. 11. A pharmaceutical composition comprising a compound as in claim 8 and guanosine, inosine, xanthoεine or deoxyinosine. 12. A pharmaceutical composition comprising a compound as in claim 8 and at least one radioprotective compound selected from the group consiεting of WR-2721, NAC, DDC, cyεteamine, 2-mercaptoethanol, mercaptoethylamine, dithiothreitol, glutathione, 2-mercaptoethaneεulfonic acid, WR-1065, nicotinamide, 5-hydroxytryptamine, 2-beta- aminoethyl-iεothiouronium-Br-Hbr, glucan, GLP/B04, GLP/B05, OK-432, Bioεtim, PSK, Lentinan, Schizophyllan, Rhodexman, Levan, Mannozym, MVE-2, MNR, MMZ, IL-1, TNF, thymic factor TF-5, glutathione peroxidaεe, εuperoxide diεmutaεe, catalaεe, glutathione reductase, glutathione tranferase, selenium, CdCl2, MnCl2, Zn acetate, Vitamin A, beta carotene, prostaglandins, tocopherol, methylene blue and PABA. 13. A pharmaceutical composition comprising a compound as in claim 8 and a pharmaceutically acceptable carrier. 14. A pharmaceutical composition as in claim 13 in the form of a liquid, a suεpension, an emulsion, a tablet, a dragee, an injectable solution, an injectable emulsion, a topical εolution or a suppository. ι5. A pharmaceutical composition comprising a compound as in claim 8 and a nonionic surfactant. 16. A pharmaceutical composition as in claim 13 wherein said compound is present in from 0.1-99 % by weight of said composition. 17. A pharmaceutical composition comprising a compound as in claim 8 incorporated into liposomes. 18. A pharmaceutical composition as in claim 13 in the form of a bioerodible matrix. 19. The pharmaceutical composition as recited in claim 18, wherein said bioerodiblε matrix comprises a polymer selected from the group consisting of polylactate and a lactate-glycolate copolymer. 20. A method for treating or preventing cytopenia comprising administering to an animal a pharmaceutically effective amount of one or more compounds having the formula: R A = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and R ^ = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and Z = H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and L = H or O p , where R,, = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and M = H or 0R F , where R E = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, with the proviso that at least one of L and M is H, and Q = H, a halogen, NHR F where R F iε H or an acyl or alkyl radical containing 1 to 10 carbon atomε, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G iε H or an acyl or alkyl radical containing l to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R,, is H or an acyl or alkyl radical containing 1 to 10 carbon atomε, and the C-C bond between the 2' and 3' positions of the aldose moiety is optionally present, or a pharmaceutically acceptable salt thereof. 21. A method as in claim 20 wherein said cytopenia is due to ionizing radiation. 22. A method as in claim 20 wherein said cytopenia is due to pharmaceutical drugs which reduce blood cell countε. 23. A method as in claim 20 wherein said cytopenia is due to antineoplastic agentε. 24. A method as in claim 20 wherein said cytopenia is due to antiviral agents. 25. A method as in claim 20 wherein said cytopenia is due to AIDS. 26. A method as in claim 20 wherein said cytopenia is due to cancer. 27. A method as in claim 26 wherein prior to, during, or after said administering step is the step of administering irradiation or chemotherapy. 28. A method as recited in claim 20 wherein εaid cytopenia iε anemia, neutropenia, thrombocytopenia, or lymphocytopenia. 29. A method as recited in claim 20 wherein said cytopenia is due to damaged bone marrow. 30. A method for modifying blood cell counts comprising administering to an animal a pharmaceutically effective amount of one or more compounds having the formula: 92/13561 120 R A = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and R n = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and Z = H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and L = H or O p , where R. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and M = H or 0R E , where R. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, with the proviso that at least one of L and M iε H, and Q = H, a halogen, NHR F where R F iε H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which caεe the adjacent carbon-nitrogen double bond iε a single bond and an H is then attached to that nitrogen, SR G where R-. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR., where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and 121 the C-C bond between the 2' and 3' positions of the aldose moiety is optionally present, or a pharmaceutically acceptable salt thereof. 31. A method for treating or preventing infection comprising administering to an animal a pharmaceutically effective amount of one or more compounds having the formula: R. H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and R n = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and Z - H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and L = H or OR p , where R^ = H or an acy? radical of a carboxylic acid with 2 to 30 carbon atoms, and M = H or 0R C , where R E = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, with the proviso that at least one of L and M is H, and Q = H, a halogen, NHR F where R F is H or an acyl or alkyl radical containing 1 to 10 carbon atomε, S divalently bound to the carbon in which caεe the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR G where R G iε H or an acyl or alkyl radical containing 1 to 10 carbon atomε, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a εingle bond and an H iε then attached to that nitrogen, or OR,, where R,, iε H or an acyl or alkyl radical containing 1 to 10 carbon atomε, and the C-C bond between the 2' and 3' positions of the aldose moiety is optionally present, or a pharmaceutically acceptable salt thereof. 32. A method for accelerating or improving recovery after bone marrow transplantation comprising administering to an animal a pharmaceutically effective amount of one or more compounds having the formula: R A = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and R B = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and Z = H, OH, =0, or NHR C where R c = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and L = H or OR.,, where R. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, and M = H or 0R E , where R E = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, with the proviso that at least one of L and M is H, and Q = H, a halogen, NHR F where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, SR-. where R-. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, O divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR,, where R, is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and the C-C bond between the 2' and 3' positions of the aldose moiety is optionally present, or a pharmaceutically acceptable salt thereof. 33. A pharmaceutical composition comprising: (a) one or more compounds having the formula R A = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atomε; R,, = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atomε, and Z = H, OH, =0, or NHR-. where R-. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atomε, and L = H or OR,,, where R,, = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atomε, and M = H or OR-,, where R. = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atomε, with the proviεo that at least one of L and M is H, and further with the proviso that at least one of R A , R^, R c , R., or R-, is not H, and Q = H, a halogen, NHR, where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, S divalently bound to the carbon in which case the adjacent carbon-nitrogen double bond iε a εingle bond and an H iε then attached to that nitrogen, SR C where R G iε H or an acyl or alkyl radical containing l to 10 carbon atoms, 0 divalently bound to the carbon, in which case the adjacent carbon-nitrogen double bond is a single bond and an H is then attached to that nitrogen, or OR., where R. is H or an acyl or alkyl radical containing 1 to 10 carbon atoms; where Z = NH 2 or NHR C , then Q = H or NHR r where R r is H or an acyl or alkyl radical containing 1 to 10 carbon atoms, and the C-C bond between the 2' and 3' positionε of the aldoεe moiety is optionally present, or a pharmaceutically acceptable salt thereof, and (b) a pharmaceutically acceptable carrier 34. A pharmaceutical composition aε in claim 33 further compriεing an antineoplastic agent, an antiviral agent, or other agent which decreaseε blood cell countε. 35. A pharmaceutical compoεition aε in claim 33 further compriεing erythropoietin, a colony εtimulating factor or an interleukin. 36. A pharmaceutical compoεition as in claim 33 further comprising at least one radioprotective compound selected from the group consisting of WR-2721, NAC, DDC, cystea ine, 2-mercaptoethanol, mercaptoethylamine, dithiothreitol, glutathione, 2-mercaptoethanesulfonic acid, WR-1065, nicotinamide, 5-hydroxytryptamine, 2-beta- aminoethyl-iεothiouronium-Br-Hbr, glucan, GLP/B04, GLP/B05, OK-432, Biostim, PSK, Lentinan, Schizophyllan, Rhodexman, Levan, Mannozym, MVE-2, MNR, MMZ, IL-1, TNF, thymic factor TF-5, glutathione peroxidase, superoxide dismutase, catalase, glutathione reductase, glutathione transferase, selenium, CdC12, MnC12, Zn acetate, Vitamin A, beta carotene, prostaglandins, tocopherol, methylene blue and PABA. 37. A pharmaceutical composition as in claim 33 in the form of a liquid, a suεpenεion, an emulεion, a tablet, a dragee, an injectable εolution, an injectable emulεion, a topical solution or a suppository. 38. A pharmaceutical composition as in claim 33 further comprising a nonionic εurfactant. 39. A pharmaceutical compoεition as in claim 33 wherein said compound is present in from 0.1-99 % by weight of said composition. 40. A pharmaceutical composition as in claim 33 in the form of liposomes. 41. A pharmaceutical compoεition as in claim 33 in the form of a bioerodible matrix. 42. The pharmaceutical composition as recited in claim 41, wherein said bioerodible matrix comprises a polymer selected from the group consisting of polylactate and a lactate-glycolate copolymer. 43. A composition comprising (i) a nonionic surfactant and (ii) erythropoietin, a colony stimulating factor, or an interleukin. 44. A method of treating cytopenia comprising administering to an animal a pharmaceutically effective amount of a nonionic surfactant. 45. A method of synthesizing an acyl derivative of guanosine comprising the stepε of reacting an activated carboxylic acid εelected from the group consisting of: a. an unbranched fatty acid with 6 to 22 carbon atoms, b. an amino acid εelected from the group conεiεting of glycine, the L formε of alanine, valine, leucine, isoleucine, tyroεine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms; with guanosine, and isolating said acyl derivative. 46. A method of syntheεizing an acyl derivative of inosine comprising the steps of reacting an activated carboxylic acid selected from the group consisting of: a. an unbranched fatty acid with 3 to 22 carbon atoms, b. a dicarboxylic acid having 3-22 carbon atoms, c. nicotinic acid or d. a cycloalkyl carboxylic acid containing 4 to 22 carbon atomε; with inoεine, and isolating said acyl derivative. 47. A method of synthesizing an acyl derivative of deoxyinosine comprising the steps of reacting an activated carboxylic acid selected from the group consiεting of: a. an unbranched fatty acid with 3 to 22 carbon atomε, b. an amino acid εelected from the group conεiεting of glycine, the L formε of phenylalanine, alanine, valine, leucine, iεoleucine, tyroεine, proline, hydroxyproline, serine, threonine, cysteine, aεpartic acid, glutamic acid, arginine, lyεine, hiεtidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atomε, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms; with deoxyinosine, and isolating said acyl derivative. 48. A method of syntheεizing an acyl derivative of xanthoεine comprising the stepε of reacting an activated carboxylic acid selected from the group consisting of: a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, iεoleucine, tyroεine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms; with xanthosine, and isolating said acyl derivative. 49. A method of syntheεizing an acyl derivative of 2',3'-acyclic inosine dialcohol comprising the stepε of reacting an activated carboxylic acid selected from the group consisting of: a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consisting of glycine, the L forms of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms; with 2' ,3'-acyclic inosine dialcohol, and iεolating εaid acyl derivative. 50. A method of εyntheεizing an acyl derivative of 2-substituted 2',3'-acyclic inosine dialcohol, wherein the substituent in the 2 position of the oxypurine moiety is OH, =0, or NHR where R = H or an acyl radical of a carboxylic acid with 2 to 30 carbon atoms, comprising the steps of reacting an activated carboxylic acid selected from the group consisting of: a. an unbranched fatty acid with 3 to 22 carbon atoms, b. an amino acid selected from the group consiεting of glycine, the L formε of phenylalanine, alanine, valine, leucine, isoleucine, tyrosine, proline, hydroxyproline, serine, threonine, cysteine, aspartic acid, glutamic acid, arginine, lysine, histidine and ornithine, c. a dicarboxylic acid having 3-22 carbon atoms, d. nicotinic acid or e. a cycloalkyl carboxylic acid containing 4 to 22 carbon atoms; with 2' ,3'-acyclic inosine dialcohol, and iεolating εaid acyl derivative.

Inventors: BAMAT MICHAEL KEVIN, BUTLER JAMES CHARLES, HILTBRAND BRADLEY MARK, VON BORSTEL REID WARREN, BAMAT, MICHAEL, KEVIN, BUTLER, JAMES, CHARLES, HILTBRAND, BRADLEY, MARK, VON BORSTEL, REID, WARREN
Applicants: PRO NEURON INC, PRO-NEURON, INC.
Application year: 1992
Main classification: A61K47
IPC codes: A61K9, A61K31, A61K38, A61K45, A61K47, A61P7, A61P31, A61P35, A61P37, A61P43, C07D473, C07H19