Source: http://www.google.com/patents/US20070173440?dq=7,546,338
Timestamp: 2017-03-31 01:51:24
Document Index: 789741721

Matched Legal Cases: ['art, 1', 'art, 18', 'art, 24', 'art, 36', 'art, 48', 'art, 52', 'art, 60', 'art, 72', 'art, 84']

Patent US20070173440 - Methods and pharmaceutical compositions for the treatment and prevention of ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsThis invention relates to cyclosporin derivatives of general formula (I): wherein A, B, R1, R2 and X are as defined in the specification, and pharmaceutical compositions prepared from the same, for use in treatment of hepatitis C virus....http://www.google.com/patents/US20070173440?utm_source=gb-gplus-sharePatent US20070173440 - Methods and pharmaceutical compositions for the treatment and prevention of hepatitis C infectionAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS20070173440 A1Publication typeApplicationApplication numberUS 11/542,930Publication dateJul 26, 2007Filing dateOct 2, 2006Priority dateSep 30, 2005Also published asCA2623865A1, CN105169369A, EP1933859A2, US7754685, WO2007041632A2, WO2007041632A3Publication number11542930, 542930, US 2007/0173440 A1, US 2007/173440 A1, US 20070173440 A1, US 20070173440A1, US 2007173440 A1, US 2007173440A1, US-A1-20070173440, US-A1-2007173440, US2007/0173440A1, US2007/173440A1, US20070173440 A1, US20070173440A1, US2007173440 A1, US2007173440A1InventorsDavid HouckOriginal AssigneeHouck David RExport CitationBiBTeX, EndNote, RefManPatent Citations (25), Referenced by (20), Classifications (8), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethods and pharmaceutical compositions for the treatment and prevention of hepatitis C infection
US 20070173440 A1Abstract
This invention relates to cyclosporin derivatives of general formula (I): wherein A, B, R1, R2 and X are as defined in the specification, and pharmaceutical compositions prepared from the same, for use in treatment of hepatitis C virus. Images(6) Claims(28)
1. A method for treating or preventing hepatitis C virus infection in a subject in need thereof, the method comprising administering to the subject a therapeutically effective amount of a cyclosporin derivative of general formula (I): wherein: A is residue of formula (IIa) or (IIb): B is ethyl, 1-hydroxyethyl, isopropyl, or n-propyl; R1 is: straight- or branched-chain alkyl containing from one to six carbon atoms, optionally substituted by one or more groups R3 which may be the same or different; straight- or branched-chain alkenyl containing from two to six carbon atoms optionally substituted by one or more groups which may be the same or different selected from the group consisting of halogen, hydroxy, amino, monoalkylamino and dialkylamino; straight- or branched-chain alkynyl containing from two to six carbon atoms, optionally substituted by one or one or more groups which may be the same or different selected from the group consisting of halogen, hydroxy, amino, monoalkylamino and dialkylamino; cycloalkyl containing from three to six carbon atoms optionally substituted by one or more groups which may be the same or different selected from the group consisting of halogen, hydroxy, amino, monoalkylamino and dialkylamino; straight- or branched-chain alkoxycarbonyl containing from one to six carbon atoms; R2 is isobutyl or 2-hydroxyisobutyl; X is —S(O)n— or oxygen; R3 is selected from the group consisting of halogen, hydroxy, carboxyl, alkoxy, alkoxycarbonyl, —NR4R5 and —NR6(CH2)mNR4R5; each R4 and R5, which may be the same or different, is independently: hydrogen; straight- or branched-chain alkyl comprising from one to six carbon atoms, optionally substituted by one or more groups R7 which may be the same or different; straight- or branched-chain alkenyl or alkynyl comprising from two to four carbon atoms; cycloalkyl containing from three to six carbon atoms optionally substituted by straight- or branched-chain alkyl containing from one to six carbon atoms; phenyl optionally substituted by from one to five groups which may be the same or different selected from the group consisting of halogen, alkoxy, alkoxycarbonyl, amino, monoalkylamino and dialkylamino; a heterocyclic ring which may be saturated or unsaturated containing five or six ring atoms and from one to three heteroatoms which may the same or different selected from nitrogen, sulfur and oxygen; or R4 and R5, together with the nitrogen atom to which they are attached, form a saturated or unsaturated heterocyclic ring containing from four to six ring atoms, which ring may optionally contain another heteroatom selected from the group consisting of nitrogen, oxygen and sulfur and may be optionally substituted by from one to four groups which may be the same or different selected from the group consisting of alkyl, phenyl and benzyl; R6 is hydrogen or straight- or branched-chain alkyl containing from one to six carbon atoms; R7 is selected from the group consisting of halogen, hydroxy, carboxyl, alkoxycarbonyl and —NR8R9; R8 and R9, which may be the same or different, each represent hydrogen or straight- or branched-chain alkyl containing from one to six carbon atoms; n is zero, one or two; m is an integer from two to four; or a pharmaceutically acceptable salt or solvate thereof, in combination with a therapeutically effective amount of a second agent, or a pharmaceutically acceptable salt or solvate thereof. 2. The method according to claim 1 in which the second agent is selected from the group consisting of modulators of NS3-4A protease, nucleoside modulators of NS5B RNA-dependent RNA polymerase, nonnucleoside modulators of NS5B RNA-dependent RNA polymerase and immunomodulatory agents. 3. The method according to claim 1, in which the second agent is a ketoamide inhibitor of NS3/4A protease. 4. The method according to claim 3 in which the second agent is BILN 2061 or VX-950. 5. The method according to claim 3 in which the second agent is (1R, 2S, 5S)-3-azabicyclo[3,1,0]hexane-2-carboxamide,N-[3-amino-1-cyclobutylmethyl)-2,3-dioxopropyl]-3-[(2S)-2-[[[1,1-dimethylethyl]amino]carbonylamino]-3,3-dimethyl-1-oxobutyl]-6,6-dimethyl. 6. The method according to claim 1 in which the second agent is valopicitabine or 7-Deaza-2′-C-methyl-adenosine. 7. The method according to claim 1 in which the second agent is JTK-003, JTK-009, R803, HCV-371, HCV-086, HCV-796 or a benzo-1,2,4-thiadiazine. 8. The method according to claim 1 in which the second agent is a small inhibitory RNA or a short hairpin RNA capable of inhibiting HCV replication. 9. The method according to claim 1 in which the second agent is IFN, pegylated IFN or ribavirin. 10. The method according to claim 1 in which the second agent is IFNα, IFNα2a, IFNα2b or pegylated IFNα2a. 11. The method according to claim 10 further comprising the administration of ribavirin. 12. The method according to claim 1 in which the second agent is PEGASYS® or PEG-INTRON®. 13. The method according to claim 12 further comprising the administration of ribavirin. 14. The method according to claim 1 in which the second agent is a modulator of a Toll-like receptors (TLR). 15. The method according to claim 1 in which the second agent is a modulator of TLR3, TLR7, TLR8 or TLR9. 16. The method according to claim 1 in which the second agent is a polynucleotide comprising unmethylated CpG. 17. The method according to claim 1 in which the second agent is ANA975. 18. The method according to claim 1 in which the second agent is celgosivir. 19. The method of claim 1 in which the second agent is a reversible inhibitor of inosine monophosphate dehydrogenase. 20. The method of claim 1 in which the second agent is ursodeoxycholic acid, or a derivative thereof. 21. The method according to claim 1 in which said administration is sequential. 22. The method according to claim 1 in which said administration is simultaneous. 23. The method according to claim 1 in which the cyclosporin derivative of formula (I) is 3-[(R)-2-(N,N-dimethylamino)ethylthio-Sar]-4-(gamma-hydroxymethylleucine)cyclosporin, or a pharmaceutically acceptable salt or solvate thereof. 24. The method according to claim 1 in which the cyclosporin derivative is administered orally. 25. The method according to claim 1, in which the amount of cyclosporin derivative administered is from about 1 to about 1000 mg per day. 26. The method according to claim 22, in which the amount of cyclosporin derivative administered is from about 25 to 150 mg per day. 27. A composition comprising a cyclosporin derivative of general formula (I) as defined in claim 1 or a pharmaceutically acceptable salt or solvate thereof, in combination with a therapeutically effective amount of a second agent, or a pharmaceutically acceptable salt or solvate thereof. 28. A composition comprising 3-[(R)-2-(N,N-dimethylamino)ethylthio-Sar]-4-(gamma-hydroxymethylleucine)cyclosporin, or a pharmaceutically acceptable salt or solvate thereof, in combination with a therapeutically effective amount of a second agent, or a pharmaceutically acceptable salt or solvate thereof.
[0001] This application claims priority to U.S. provisional application Ser. Nos. 60/722,679, filed Sep. 30, 2005, entitled “METHODS AND PHARMACEUTICAL COMPOSITIONS FOR THE TREATMENT AND PREVENTION OF HEPATITIS C INFECTION” to David Houck and 60/787,549, filed Mar. 29, 2006, entitled “METHODS AND PHARMACEUTICAL COMPOSITIONS FOR THE TREATMENT AND PREVENTION OF HEPATITIS C INFECTION” to David Houck. The disclosure of the above referenced applications is incorporated by reference herein.
1. FIELD OF THE INVENTION [0002] The present invention provides methods and pharmaceutical compositions, for use in treatment or prevention of hepatitis C virus infection in a subject in need thereof. In certain aspects, the present invention provides methods of treating hepatitis C infection by administering to a subject in need thereof an amount of a 3-ether or 3-thioether cyclosporin of the invention in combination with a second agent in amounts effective to treat or prevent the infection. 2. BACKGROUND [0003] In 1989, a main causative virus of non-A non-B post-transfusion hepatitis was found and named hepatitis C virus (HCV). Since then, several types of hepatitis viruses have been found besides type A, type B and type C, wherein hepatitis caused by HCV is called hepatitis C. Subjects infected with HCV are considered to involve several percent of the world population, and infection with HCV characteristically becomes chronic. [0004] HCV is an envelope RNA virus, wherein the genome is a single strand plus-strand RNA, and belongs to the genus Hepacivirus of Flavivirus (from The International Committee on Taxonomy of Viruses, International Union of Microbiological Societies). Of the same hepatitis viruses, for example, hepatitis B virus (HBV), which is a DNA virus, is eliminated by the immune system, and infection with this virus ends in an acute infection except for neonates and infants having yet immature immunological competence. In contrast, HCV somehow avoids the immune system of the host due to an unknown mechanism. Once infected with this virus, even an adult having a mature immune system frequently develops persistent infection. [0005] When chronic hepatitis is associated with the persistent infection with HCV, it advances to cirrhosis or hepatic cancer in a high rate. Enucleation of tumor by operation does not help much, because the subject often develops recurrent hepatic cancer due to the sequela inflammation in non-cancerous parts. [0006] Thus, an effective therapeutic method for treating hepatitis C infection is desired. Apart from the symptomatic therapy to suppress inflammation with an anti-inflammatory agent, the development of a therapeutic agent that reduces HCV to a low level free from inflammation and that eradicates HCV has been strongly demanded. An optimal therapeutic agent would provide a virologic response classified as a “sustained virologic response,” which is defined as undetectable levels of virus in blood six months or more after completing hepatitis C therapy. [0007] At present, treatments with interferon, as a single agent or in combination with ribavirin, are the only effective methods known for the eradication of HCV. However, interferon can eradicate the virus only in about 33-46% of the subject population. For the rest of the subjects, it has no effect or provides only a temporary effect. Therefore, an anti-HCV drug to be used in the place of or concurrently with interferon is awaited in great expectation. [0008] Cyclosporin A is well known for its immunosuppressive activity and a range of therapeutic uses, including antifungal, anti-parasitic, and anti-inflammatory as well as anti-HIV activity. Cyclosporin A and certain derivatives have been reported as having anti-HCV activity, see Watashi et al., 2003, Hepatology 38:1282-1288, Nakagawa et al., 2004, Biochem. Biophys. Res. Commun. 313:42-7, and Shimotohno and Watashi, 2004, American Transplant Congress, Abstract No. 648 (American Journal of Transplantation, 2004, 4(s8):1-653). [0009] However, a problem with known cyclosporins is their nephrotoxicity. For example, cyclosporin A (cyclosporine) can cause nephrotoxicity and hepatotoxicity. Nephrotoxicity, a serious complication of cyclosporine therapy, is characterized by intense renal vasoconstriction that often progresses to chronic injury with irreversible structural renal damage (Busauschina et al., 2004 Transplant Proc. 36: pages 229S-233S, and Myers BD and Newton L., J Am Soc Nephrol. 1991, (2 Supp. 1), pages S45-52). Nephrotoxicity associated with cyclosporine has been noted in 25 to 38% of transplant subjects. Renal dysfunction can occur at any time and ranges from an early reversible damage to a late progression to irreversible chronic renal failure. Acute nephrotoxicity may appear soon after transplantation or after weeks or months, with oliguria, acute decrement of glomerular filtration rate and renal plasma flow (Kahan, 1989). [0010] In prolonged cyclosporine administration, chronic nephrotoxicity is characterized by a progressive and mostly irreversible impairment of renal function, and it is supported by histological lesions ranging from striped fibrosis to ischemic collapse of the tuft, glomerular sclerosis and tubular atrophy. [0011] Effective methods and compositions for the treatment or prevention of hepatitis C infection are needed to combat the virus worldwide. 3. SUMMARY OF THE INVENTION [0012] It has found that certain 3-substituted cyclosporin derivatives have activity against HCV. Also, it has been found that certain of said 3-substituted cyclosporin derivatives have unexpectedly good toxicological profiles, either alone or in combination with a second agent. Accordingly, the present invention provides methods of treating or preventing HCV infection with the 3-substituted cyclosporin derivatives of the invention along with a second agent effective for treating or preventing HCV infection. The present invention also provides pharmaceutical compositions for use in the methods. [0013] In one aspect, the present invention provides the use of a 3-ether or 3-thioether cyclosporin derivative of the invention along with a second therapeutic useful for the treatment or prevention of HCV infection. Exemplary therapeutic agents are described in detail in the sections below. [0014] In another aspect, the present invention provides pharmaceutical compositions, single unit dosage forms, and kits suitable for use in treating or preventing HCV infection which comprise a therapeutically or prophylactically effective amount of 3-ether or 3-thioether cyclosporin derivative and a therapeutically or prophylactically effective amount of a second therapeutic useful for the treatment or prevention of HCV infection. [0015] In certain embodiments, the 3-substituted cyclosporin derivative of the invention is selected from the group consisting of a 3-ether cyclosporin; a 3-ether, 4-gamma-hydroxymethylleucine cyclosporin; a 3-thioether cyclosporin; and a 3-thioether, 4-gamma-hydroxymethylleucine cyclosporin. In particular embodiments, the 3-substituted cyclosporin derivative is according to general formula (I): wherein: A is residue of formula (IIa) or (IIb): B is ethyl, 1-hydroxyethyl, isopropyl or n-propyl; R1 represents: straight- or branched-chain alkyl containing from one to six carbon atoms, optionally substituted by one or more groups R3 which may be the same or different; straight- or branched-chain alkenyl containing from two to six carbon atoms optionally substituted by one or more groups which may be the same or different selected from the group consisting of halogen, hydroxy, amino, monoalkylamino and dialkylamino; straight- or branched-chain alkynyl containing from two to six carbon atoms, optionally substituted by one or one or more groups which may be the same or different selected from the group consisting of halogen, hydroxy, amino, monoalkylamino and dialkylamino; cycloalkyl containing from three to six carbon atoms optionally substituted by one or more groups which may be the same or different selected from the group consisting of halogen, hydroxy, amino, monoalkylamino and dialkylamino; straight- or branched-chain alkoxycarbonyl containing from one to six carbon atoms; R2 represents isobutyl or 2-hydroxyisobutyl; X represents —S(O)n— or oxygen; R3 is selected from the group consisting of halogen, hydroxy, carboxyl, alkoxy, alkoxycarbonyl, —NR4R5 and —NR6(CH2)mNR4R5; R4 and R5, which may be the same or different, represent: hydrogen; straight- or branched-chain alkyl comprising from one to six carbon atoms, optionally substituted by one or more groups R7 which may be the same or different; straight- or branched-chain alkenyl or alkynyl comprising from two to four carbon atoms; cycloalkyl containing from three to six carbon atoms optionally substituted by straight- or branched-chain alkyl containing from one to six carbon atoms; phenyl optionally substituted by from one to five groups which may be the same or different selected from the group consisting of halogen, alkoxy, alkoxycarbonyl, amino, alkylamino and dialkylamino; a heterocyclic ring which may be saturated or unsaturated containing five or six ring atoms and from one to three heteroatoms which may the same or different selected from nitrogen, sulfur and oxygen; or R4 and R5, together with the nitrogen atom to which they are attached, form a saturated or unsaturated heterocyclic ring containing from four to six ring atoms, which ring may optionally contain another heteroatom selected from the group consisting of nitrogen, oxygen and sulfur and may be optionally substituted by from one to four groups which may be the same or different selected from the group consisting of alkyl, phenyl and benzyl; R6 represents hydrogen or straight- or branched-chain alkyl containing from one to six carbon atoms; R7 is selected from the group consisting of halogen, hydroxy, carboxyl, alkoxycarbonyl and —NR8R9; R8 and R9 which may be the same or different, each represent hydrogen or straight- or branched-chain alkyl containing from one to six carbon atoms; n is zero, one or two; m is an integer from two to four; halogen means fluoro, chloro, bromo or iodo; or a pharmaceutically acceptable salt thereof. [0028] In certain cases the substituents A, B, R1 and R2 may contribute to optical and/or stereoisomerism. All such forms are embraced by the present invention.
4. BRIEF DESCRIPTION OF THE FIGURES [0029] FIG. 1A provides the antiviral synergy volume for a combination of Compound O and IFNα. [0030] FIG. 1B provides the antiviral synergy volume for a combination of Compound T and IFNα. [0031] FIG. 1C provides the antiviral synergy volume for a combination of Cyclosporin A and IFNα. [0032] FIG. 2 provides the antiviral synergy volume for a combination of Compound O and 2′-C-methyl-cytidine. [0033] FIG. 3A provides the antiviral synergy volume for a combination of Compound O and Compound 3. [0034] FIG. 3B provides the cytotoxicity volume for a combination of Compound O and Compound 3.
5. DESCRIPTION OF EXEMPLARY EMBODIMENTS [0035] The present invention provides methods of treating or preventing hepatitis C infection in a subject in need thereof, and pharmaceutical compositions and dosage forms useful for such methods. The methods and compositions are described in detail in the sections below. [0036] 5.1 Definitions [0037] When referring to the compounds and complexes of the invention, the following terms have the following meanings unless indicated otherwise. [0038] “Cyclosporin”, refers to any cyclosporin compound known to those of skill in the art, or a derivative thereof. See, e.g., Ruegger et al., 1976, Helv. Chim. Acta. 59:1075-92; Borel et al., 1977, Immunology 32:1017-25; the contents of which are hereby incorporated by reference in their entireties. Exemplary compounds of the invention are cyclosporin derivatives. Unless noted otherwise, a cyclosporin described herein is a cyclosporin A, and a cyclosporin derivative described herein is a derivative of cyclosporin A. [0039] “Alkyl” refers to monovalent saturated aliphatic hydrocarbyl groups particularly having up to about 11 carbon atoms, more particularly as a lower alkyl, from 1 to 8 carbon atoms and still more particularly, from 1 to 6 carbon atoms. The hydrocarbon chain may be either straight-chained or branched. This term is exemplified by groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, tert-butyl, n-hexyl, n-octyl, tert-octyl and the like. The term “lower alkyl” refers to alkyl groups having 1 to 6 carbon atoms. [0040] “Alkylene” refers to divalent saturated aliphatic hydrocarbyl groups particularly having up to about 11 carbon atoms and more particularly 1 to 6 carbon atoms which can be straight-chained or branched. This term is exemplified by groups such as methylene (—CH2—), ethylene (—CH2CH2—), the propylene isomers (e.g., —CH2CH2CH2— and —CH(CH3)CH2—) and the like. [0041] “Alkenyl” refers to monovalent olefinically unsaturated hydrocarbyl groups preferably having up to about 11 carbon atoms, particularly, from 2 to 8 carbon atoms, and more particularly, from 2 to 6 carbon atoms, which can be straight-chained or branched and having at least 1 and particularly from 1 to 2 sites of olefinic unsaturation. Particular alkenyl groups include ethenyl (—CH═CH2), n-propenyl (—CH2CH═CH2), isopropenyl (—C(CH3)═CH2), vinyl and substituted vinyl, and the like. [0042] “Alkenylene” refers to divalent olefinically unsaturated hydrocarbyl groups particularly having up to about 11 carbon atoms and more particularly 2 to 6 carbon atoms which can be straight-chained or branched and having at least 1 and particularly from 1 to 2 sites of olefinic unsaturation. This term is exemplified by groups such as ethenylene (—CH═CH—), the propenylene isomers (e.g., —CH═CHCH2— and —C(CH3)═CH— and —CH═C(CH3)—) and the like. [0043] “Alkynyl” refers to acetylenically unsaturated hydrocarbyl groups particularly having up to about 11 carbon atoms and more particularly 2 to 6 carbon atoms which can be straight-chained or branched and having at least 1 and particularly from 1 to 2 sites of alkynyl unsaturation. Particular non-limiting examples of alkynyl groups include acetylenic, ethynyl (—C≡CH), propargyl (—CH2C≡CH), and the like. [0044] “Alkoxy” refers to the group —OR where R is alkyl. Particular alkoxy groups include, by way of example, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, tert-butoxy, sec-butoxy, n-pentoxy, n-hexoxy, 1,2-dimethylbutoxy, and the like. [0045] “Alkoxycarbonyl” refers to a radical —C(O)-alkoxy where alkoxy is as defined herein. [0046] “Amino” refers to the radical —NH2. [0047] “Carboxyl” refers to the radical —C(O)OH. [0048] “Dialkylamino” means a radical —NRR′ where R and R′ independently represent an alkyl, substituted alkyl, aryl, substituted aryl, cycloalkyl, substituted cycloalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, heteroaryl, or substituted heteroaryl group as defined herein. [0049] “Halogen” or “halo” refers to chloro, bromo, fluoro or iodo. [0050] “Hydroxy” refers to the radical —OH. [0051] “Monoalkylamino” refers to the group alkyl-NR′—, wherein R′ is selected from hydrogen and alkyl. [0052] “Nitro” refers to the radical —NO2. [0053] “Thioalkoxy” refers to the group —SR where R is alkyl. [0054] “Pharmaceutically acceptable salt” refers to any salt of a compound of this invention which retains its biological properties and which is not toxic or otherwise undesirable for pharmaceutical use. Such salts may be derived from a variety of organic and inorganic counter-ions well known in the art and include. Such salts include: (1) acid addition salts formed with organic or inorganic acids such as hydrochloric, hydrobromic, sulfuric, nitric, phosphoric, sulfamic, acetic, trifluoroacetic, trichloroacetic, propionic, hexanoic, cyclopentylpropionic, glycolic, glutaric, pyruvic, lactic, malonic, succinic, sorbic, ascorbic, malic, maleic, fumaric, tartaric, citric, benzoic, 3-(4-hydroxybenzoyl)benzoic, picric, cinnamic, mandelic, phthalic, lauric, methanesulfonic, ethanesulfonic, 1,2-ethane-disulfonic, 2-hydroxyethanesulfonic, benzenesulfonic, 4-chlorobenzenesulfonic, 2-naphthalenesulfonic, 4-toluenesulfonic, camphoric, camphorsulfonic, 4-methylbicyclo[2.2.2]-oct-2-ene-1-carboxylic, glucoheptonic, 3-phenylpropionic, trimethylacetic, tert-butylacetic, lauryl sulfuric, gluconic, benzoic, glutamic, hydroxynaphthoic, salicylic, stearic, cyclohexylsulfamic, quinic, muconic acid and the like acids; or (2) salts formed when an acidic proton present in the parent compound either (a) is replaced by a metal ion, e.g., an alkali metal ion, an alkaline earth ion or an aluminum ion, or alkali metal or alkaline earth metal hydroxides, such as sodium, potassium, calcium, magnesium, aluminum, lithium, zinc, and barium hydroxide, ammonia or (b) coordinates with an organic base, such as aliphatic, alicyclic, or aromatic organic amines, such as ammonia, methylamine, dimethylamine, diethylamine, picoline, ethanolamine, diethanolamine, triethanolamine, ethylenediamine, lysine, arginine, ornithine, choline, N,N′-dibenzylethylene-diamine, chloroprocaine, diethanolamine, procaine, N-benzylphenethylamine, N-methylglucamine piperazine, tris(hydroxymethyl)-aminomethane, tetramethylammonium hydroxide, and the like. [0055] Salts further include, by way of example only, sodium, potassium, calcium, magnesium, ammonium, tetraalkylammonium and the like, and when the compound contains a basic functionality, salts of non-toxic organic or inorganic acids, such as hydrohalides, e.g. hydrochloride and hydrobromide, sulfate, phosphate, sulfamate, nitrate, acetate, trifluoroacetate, trichloroacetate, propionate, hexanoate, cyclopentylpropionate, glycolate, glutarate, pyruvate, lactate, malonate, succinate, sorbate, ascorbate, malate, maleate, fumarate, tartarate, citrate, benzoate, 3-(4-hydroxybenzoyl)benzoate, picrate, cinnamate, mandelate, phthalate, laurate, methanesulfonate (mesylate), ethanesulfonate, 1,2-ethane-disulfonate, 2-hydroxyethanesulfonate, benzenesulfonate (besylate), 4-chlorobenzenesulfonate, 2-naphthalenesulfonate, 4-toluenesulfonate, camphorate, camphorsulfonate, 4-methylbicyclo[2.2.2]-oct-2-ene-1-carboxylate, glucoheptonate, 3-phenylpropionate, trimethylacetate, tert-butylacetate, lauryl sulfate, gluconate, benzoate, glutamate, hydroxynaphthoate, salicylate, stearate, cyclohexylsulfamate, quinate, muconate and the like. [0056] The term “physiologically acceptable cation” refers to a non-toxic, physiologically acceptable cationic counterion of an acidic functional group. Such cations are exemplified by sodium, potassium, calcium, magnesium, ammonium and tetraalkylammonium cations and the like. [0057] “Solvate” refers to a compound of the present invention or a salt thereof, that further includes a stoichiometric or non-stoichiometric amount of solvent bound by non-covalent intermolecular forces. Where the solvent is water, the solvate is a hydrate. [0058] It is to be understood that compounds having the same molecular formula but differing in the nature or sequence of bonding of their atoms or in the arrangement of their atoms in space are termed “isomers.” Isomers that differ in the arrangement of their atoms in space are termed “stereoisomers.”
[0059] Stereoisomers that are not mirror images of one another are termed “diastereomers” and those that are non-superimposable mirror images of each other are termed “enantiomers”. When a compound has an asymmetric center, for example, when it is bonded to four different groups, a pair of enantiomers is possible. An enantiomer can be characterized by the absolute configuration of its asymmetric center and is designated (R) or (S) according to the rules of Cahn and Prelog (Cahn et al., 1966, Angew. Chem. 78:413-447, Angew. Chem., Int. Ed. Engl. 5:385-414: (errata: Angew. Chem., Int. Ed. Engl. 5:511); Prelog and Helmchen, 1982, Angew. Chem. 94:614-631, Angew. Chem. Internat. Ed. Eng. 21:567-583; Mata and Lobo, 1993, Tetrahedron: Asymmetry 4:657-668) or can be characterized by the manner in which the molecule rotates the plane of polarized light and is designated dextrorotatory or levorotatory (i.e., as (+)- or (−)-isomers, respectively). A chiral compound can exist as either individual enantiomer or as a mixture thereof. A mixture containing equal proportions of enantiomers is called a “racemic mixture.”
[0060] In certain embodiments, the compounds of this invention may possess one or more asymmetric centers; such compounds can therefore be produced as the individual (R)- or (S)-enantiomer or as a mixture thereof. Unless indicated otherwise, for example by designation of stereochemistry at any position of a formula, the description or naming of a particular compound in the specification and claims is intended to include both individual enantiomers and mixtures, racemic or otherwise, thereof. Methods for determination of stereochemistry and separation of stereoisomers are well-known in the art. In particular embodiments, the present invention provides the stereoisomers of the compounds depicted herein upon treatment with base. [0061] In certain embodiments, the compounds of the invention are “stereochemically pure.” A stereochemically pure compound or has a level of stereochemical purity that would be recognized as “pure” by those of skill in the art. Of course, this level of purity will be less than 100%. In certain embodiments, “stereochemically pure” designates a compound that is substantially free of alternate isomers. In particular embodiments, the compound is 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or 99.9% free of other isomers. [0062] “Sarcosine” or “Sar” refers to the amino acid residue known to those of skill in the art having the structure —N(Me)CH2C(O)—. Those of skill in the art might recognize sarcosine as N-methyl glycine. [0063] As used herein, the terms “subject” and “patient” are used interchangeably herein. The terms “subject” and “subjects” refer to an animal, such as a mammal including a non-primate (e.g., a cow, pig, horse, cat, dog, rat, and mouse) and a primate (e.g., a monkey such as a cynomolgous monkey, a chimpanzee and a human), and for example, a human. In one embodiment, the subject is refractory or non-responsive to current treatments for hepatitis C infection. In another embodiment, the subject is a farm animal (e.g., a horse, a cow, a pig, etc.) or a pet (e.g., a dog or a cat). In one embodiment, the subject is a human. [0064] As used herein, the terms “therapeutic agent” and “therapeutic agents” refer to any agent(s) which can be used in the treatment or prevention of a disorder or one or more symptoms thereof. In certain embodiments, the term “therapeutic agent” refers to a compound of the invention. In certain other embodiments, the term “therapeutic agent” refers does not refer to a compound of the invention. In one embodiment, a therapeutic agent is an agent which is known to be useful for, or has been or is currently being used for the treatment or prevention of a disorder or one or more symptoms thereof. [0065] “Therapeutically effective amount” means an amount of a compound or complex or composition that, when administered to a subject for treating a disease, is sufficient to effect such treatment for the disease. A “therapeutically effective amount” can vary depending on, inter alia, the compound, the disease and its severity, and the age, weight, etc., of the subject to be treated. [0066] “Treating” or “treatment” of any disease or disorder refers, in one embodiment, to ameliorating a disease or disorder that exists in a subject. In another embodiment, “treating” or “treatment” refers to ameliorating at least one physical parameter, which may be indiscernible by the subject. In yet another embodiment, “treating” or “treatment” refers to modulating the disease or disorder, either physically (e.g., stabilization of a discernible symptom) or physiologically (e.g., stabilization of a physical parameter) or both. In yet another embodiment, “treating” or “treatment” refers to delaying the onset of the disease or disorder. [0067] As used herein, the terms “prophylactic agent” and “prophylactic agents” as used refer to any agent(s) which can be used in the prevention of a disorder or one or more symptoms thereof. In certain embodiments, the term “prophylactic agent” refers to a compound of the invention. In certain other embodiments, the term “prophylactic agent” does not refer a compound of the invention. For example, a prophylactic agent is an agent which is known to be useful for, or has been or is currently being used to the prevent or impede the onset, development, progression and/or severity of a disorder. [0068] As used herein, the terms “prevent,” “preventing” and “prevention” refer to the prevention of the recurrence, onset, or development of one or more symptoms of a disorder in a subject resulting from the administration of a therapy (e.g., a prophylactic or therapeutic agent), or the administration of a combination of therapies (e.g., a combination of prophylactic or therapeutic agents). [0069] As used herein, the phrase “prophylactically effective amount” refers to the amount of a therapy (e.g., prophylactic agent) which is sufficient to result in the prevention of the development, recurrence or onset of one or more symptoms associated with a disorder (, or to enhance or improve the prophylactic effect(s) of another therapy (e.g., another prophylactic agent). [0070] As used herein, the term “in combination” refers to the use of more than one therapies (e.g., one or more prophylactic and/or therapeutic agents). The use of the term “in combination” does not restrict the order in which therapies (e.g., prophylactic and/or therapeutic agents) are administered to a subject with a disorder. A first therapy (e.g., a prophylactic or therapeutic agent such as a compound of the invention) can be administered prior to (e.g., 5 minutes, 15 minutes, 30 minutes, 45 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours, 24 hours, 48 hours, 72 hours, 96 hours, 1 week, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 8 weeks, or 12 weeks before), concomitantly with, or subsequent to (e.g., 5 minutes, 15 minutes, 30 minutes, 45 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours, 24 hours, 48 hours, 72 hours, 96 hours, 1 week, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 8 weeks, or 12 weeks after) the administration of a second therapy (e.g., a prophylactic or therapeutic agent) to a subject with a disorder. [0071] As used herein, the term “synergistic” refers to a combination of a compound of the invention and another therapy (e.g., a prophylactic or therapeutic agent) which has been or is currently being used to prevent, manage or treat a disorder, which is more effective than the additive effects of the therapies. A synergistic effect of a combination of therapies (e.g., a combination of prophylactic or therapeutic agents) permits the use of lower dosages of one or more of the therapies and/or less frequent administration of said therapies to a subject with a disorder. The ability to utilize lower dosages of a therapy (e.g., a prophylactic or therapeutic agent) and/or to administer said therapy less frequently reduces the toxicity associated with the administration of said therapy to a subject without reducing the efficacy of said therapy in the prevention or treatment of a disorder). In addition, a synergistic effect can result in improved efficacy of agents in the prevention or treatment of a disorder. Finally, a synergistic effect of a combination of therapies (e.g., a combination of prophylactic or therapeutic agents) may avoid or reduce adverse or unwanted side effects associated with the use of either therapy alone. [0072] The term “label” refers to a display of written, printed or graphic matter upon the immediate container of an article, for example the written material displayed on a vial containing a pharmaceutically active agent. [0073] The term “labeling” refers to all labels and other written, printed or graphic matter upon any article or any of its containers or wrappers or accompanying such article, for example, a package insert or instructional videotapes or DVDs accompanying or associated with a container of a pharmaceutically active agent. [0074] 5.2 Embodiments of the Invention [0075] The present invention is based, in part, on the discovery that compounds of the invention are effective for the treatment and prevention of hepatitis C infection in a subject in need thereof. Accordingly, the present invention provides methods of treating hepatitis C infection in a subject in need thereof. The present invention further provides methods of preventing hepatitis C infection in a subject in need thereof. In general, the methods of the invention comprise the step of administering to the subject in need thereof an amount of a compound of the invention effective for the treatment or prevention of the hepatitis C infection in combination with a second agent effective for the treatment or prevention of the infection. Methods of treatment are described in detail in the sections below. The compound can be any compound of the invention as described in the sections below, and the second agent can be any second agent described in the sections below. In certain embodiments, the compound is in the form of a pharmaceutical composition or dosage form, as described in the sections below. [0076] While not intending to be bound by any particular theory of operation, it is believed that compounds of the invention inhibit hepatitis C virus (HCV) replication by a mechanism distinct from that of current HCV therapy. Current therapy for HCV, as mentioned above, is co-administration of interferon and ribavirin. It is believed that the current therapy operates by modulation of the immune system of a subject to treat or prevent infection by HCV. It is believed that compounds of the present invention operate by modulating or inhibiting cellular processes critical for HCV replication in a host. Such mechanisms are discussed in the examples below. Operating by a novel mechanism, the compounds, compositions and methods of the invention offer a novel therapy for the treatment or prevention of HCV infection. As such they are advantageous for any subject infected with, or at risk for infection with, HCV and particularly for subjects that have not responded to current therapy. [0077] In embodiments of the invention, the subject can be any subject infected with, or at risk for infection with, HCV. Infection or risk for infection can be determined according to any technique deemed suitable by the practitioner of skill in the art. In one embodiment, subjects are humans infected with HCV. [0078] The HCV can be any HCV known to those of skill in the art. There are at least six genotypes and at least 50 subtypes of HCV currently known to those of skill in the art. The HCV can be of any genotype or subtype known to those of skill. In certain embodiments, the HCV is of a genotype or subtype not yet characterized. In certain embodiments, the subject is infected with HCV of a single genotype. In certain embodiments, the subject is infected with HCV of multiple subtypes, quasispecies, or multiple genotypes. [0079] In certain embodiments, the HCV is genotype 1 and can be of any subtype. For instance, in certain embodiments, the HCV is subtype 1a, 1b or 1c. It is believed that HCV infection of genotype 1 responds poorly to current interferon therapy. Methods of the present invention can be advantageous for therapy of HCV infection with genotype 1. [0080] In certain embodiments, the HCV is other than genotype 1. In certain embodiments, the HCV is genotype 2 and can be of any subtype. For instance, in certain embodiments, the HCV is subtype 2a, 2b or 2c. In certain embodiments, the HCV is genotype 3 and can be of any subtype. For instance, in certain embodiments, the HCV is subtype 3a, 3b or 10a. In certain embodiments, the HCV is genotype 4 and can be of any subtype. For instance, in certain embodiments, the HCV is subtype 4a. In certain embodiments, the HCV is genotype 5 and can be of any subtype. For instance, in certain embodiments, the HCV is subtype 5a. In certain embodiments, the HCV is genotype 6 and can be of any subtype. For instance, in certain embodiments, the HCV is subtype 6a, 6b, 7b, 8b, 9a or 11a. See, e.g., Simmonds, 2004, J Gen Virol. 85:3173-88; Simmonds, 2001, J. Gen. Virol., 82, 693-712, the contents of which are incorporated by reference in their entirety. [0081] In certain embodiments of the invention, the subject has never received therapy or prophylaxis for HCV infection. In further embodiments of the invention, the subject has previously received therapy or prophylaxis for HCV infection. For instance, in certain embodiments, the subject has not responded to HCV therapy. Indeed, under current interferon therapy, up to 50% or more HCV subjects do not respond to therapy. In certain embodiments, the subject can be a subject that received therapy but continued to suffer from viral infection or one or more symptoms thereof. In certain embodiments, the subject can be a subject that received therapy but failed to achieve a sustained virologic response. In certain embodiments, the subject has received therapy for HCV infection but has failed show a 2 log10 decline in HCV RNA levels after 12 weeks of therapy. It is believed that subjects who have not shown more than 2 log10 reduction in serum HCV RNA after 12 weeks of therapy have a 97-100% chance of not responding. Since the compounds of the present invention act by mechanism other than current HCV therapy, it is believed that compounds of the invention should be effective in treating such nonresponders. [0082] In certain embodiments, the subject is a subject that discontinued HCV therapy because of one or more adverse events associated with the therapy. In certain embodiments, the subject is a subject where current therapy is not indicated. For instance, certain therapies for HCV are associated with neuropsychiatric events. Interferon (IFN)-alfa plus ribavirin is associated with a high rate of depression. Depressive symptoms have been linked to a worse outcome in a number of medical disorders. Life-threatening or fatal neuropsychiatric events, including suicide, suicidal and homicidal ideation, depression, relapse of drug addiction/overdose, and aggressive behavior have occurred in subjects with and without a previous psychiatric disorder during HCV therapy. Interferon-induced depression is a limitation for the treatment of chronic hepatitis C, especially for subjects with psychiatric disorders. Psychiatric side effects are common with interferon therapy and responsible for about 10% to 20% of discontinuations of current therapy for HCV infection. [0083] Accordingly, the present invention provides methods of treating or preventing HCV infection in subjects where the risk of neuropsychiatric events, such as depression, contraindicates treatment with current HCV therapy. The present invention also provides methods of treating or preventing HCV infection in subjects where a neuropsychiatric event, such as depression, or risk of such indicates discontinuation of treatment with current HCV therapy. The present invention further provides methods of treating or preventing HCV infection in subjects where a neuropsychiatric event, such as depression, or risk of such indicates dose reduction of current HCV therapy. [0084] Current therapy is also contraindicated in subjects that are hypersensitive to interferon or ribavirin, or both, or any other component of a pharmaceutical product for administration of interferon or ribavirin. Current therapy is not indicated in subjects with hemoglobinopathies (e.g., thalassemia major, sickle-cell anemia) and other subjects at risk from the hematologic side effects of current therapy. Common hematologic side effects include bone marrow suppression, neutropenia and thrombocytopenia. Furthermore, ribavirin is toxic to red blood cells and is associated with hemolysis. Accordingly, the present invention also provides methods of treating or preventing HCV infection in subjects hypersensitive to interferon or ribavirin, or both, subjects with a hemoglobinopathy, for instance thalassemia major subjects and sickle-cell anemia subjects, and other subjects at risk from the hematologic side effects of current therapy. [0085] In certain embodiments, the subject has received HCV therapy and discontinued that therapy prior to administration of a method of the invention. In further embodiments, the subject has received therapy and continues to receive that therapy along with administration of a method of the invention. The methods of the invention can be co-administered with other therapy for HCV according to the judgment of one of skill in the art. In certain embodiments, the methods or compositions of the invention can be co-administered with a reduced dose of the other therapy for HCV. [0086] In certain embodiments, the present invention provides methods of treating a subject that is refractory to treatment with interferon. For instance, in some embodiments, the subject can be a subject that has failed to respond to treatment with one or more agents selected from the group consisting of interferon, interferon α, pegylated interferon α, interferon plus ribavirin, interferon α plus ribavirin and pegylated interferon α plus ribavirin. In some embodiments, the subject can be a subject that has responded poorly to treatment with one or more agents selected from the group consisting of interferon, interferon α, pegylated interferon α, interferon plus ribavirin, interferon α plus ribavirin and pegylated interferon α plus ribavirin. A pro-drug form of ribavirin, such as taribavirin, may also be used. [0087] In further embodiments, the present invention provides methods of treating HCV infection in subjects that are pregnant or might get pregnant since current therapy is also contraindicated in pregnant women. [0088] In certain embodiments, the subject has, or is at risk for, co-infection of HCV with HIV. For instance, in the United States, 30% of HIV subjects are co-infected with HCV and evidence indicates that people infected with HIV have a much more rapid course of their hepatitis C infection. Maier and Wu, 2002, World J Gastroenterol 8:577-57. The methods of the invention can be used to treat or prevent HCV infection in such subjects. It is believed that elimination of HCV in these subjects will lower mortality due to end-stage liver disease. Indeed, the risk of progressive liver disease is higher in subjects with severe AIDS-defining immunodeficiency than in those without. See, e.g., Lesens et al., 1999, J Infect Dis 179:1254-1258. In one embodiment, compounds of the invention have been shown to suppress HIV in HIV subjects. See, e.g., U.S. Pat. Nos. 5,977,067; 5,994,299, 5,948,884 and 6,583,265 and PCT publication nos. WO99/32512, WO99/67280, the contents of which are hereby incorporated by reference in their entireties. Thus, in certain embodiments, the present invention provides methods of treating or preventing HIV infection and HCV infection in subjects in need thereof. [0089] In certain embodiments, the methods or compositions of the invention are administered to a subject following liver transplant. Hepatitis C is a leading cause of liver transplantation in the U.S., and many subjects that undergo liver transplantation remain HCV positive following transplantation. The present invention provides methods of treating such recurrent HCV subjects with a compound or composition of the invention. In certain embodiments, the present invention provides methods of treating a subject before, during or following liver transplant to prevent recurrent HCV infection. [0090] 5.2.1 Compounds Used in the Invention [0091] In certain embodiments, the compound of the invention is a cyclosporin derivative effective for the treatment or prevention of hepatitis C infection in a subject in need thereof. Unless noted otherwise, the term “cyclosporin” as used herein refers to the compound cyclosporin A as known to those of skill in the art. See, e.g., Ruegger et al., 1976, Helv. Chim. Acta. 59:1075-92; Borel et al., 1977, Immunology 32:1017-25; the contents of which are hereby incorporated by reference in their entireties. The term “cyclosporin derivative” refers to any cyclosporin derivative with activity against hepatitis C infection, whether the derivative is natural, synthetic or semi-synthetic. [0092] In particular embodiments, the cyclosporin derivative differs from cyclosporin A at the third position, i.e. the N-methyl glycine position, known to those of skill in the art. In certain embodiments, the cyclosporin derivative is a 3-ether cyclosporin. In further embodiments, the cyclosporin derivative is a 3-thioether cyclosporin. The cyclosporin derivative can further comprise other cyclosporin modifications known to those of skill in the art. In further embodiments, the cyclosporin further comprises a 4-gamma-hydroxymethylleucine residue. Accordingly, in certain embodiments, the cyclosporin derivative is a 3-ether, 4-gamma-hydroxymethylleucine. In further embodiments, the cyclosporin derivative is a 3-thioether, 4-gamma-hydroxymethylleucine. [0093] In certain embodiments, the present invention provides methods of treating or preventing hepatitis C infection in a subject comprising administering to the subject a therapeutically or prophylactically effective amount of a cyclosporin derivative of general formula (I), or a pharmaceutically acceptable salt or solvate thereof: [0094] along with a second agent effective for treating or preventing HCV infection. [0095] In formula (I), A, B, X, R1 and R2 are as defined above. [0096] In certain embodiments, A is according to formula (IIa). In further embodiments, A is according to formula (IIb). In one embodiment, A is a residue of formula (IIa) above. [0097] In certain embodiments, B is ethyl. [0098] In certain embodiments, R1 is 2-aminoethyl, 2-aminopropyl, 2-monoalkylaminoethyl, 2-monoalkylaminopropyl; 2-dialkylaminoethyl 2-dialkylaminopropyl, 2-monocycloalkylaminoethyl, 2-monocycloalkylaminopropyl, 2-dicycloalkylaminoethyl or 2-dialkylaminopropyl wherein alkyl is straight- or branched-chain containing from one to four carbon atoms, and cycloalkyl contains from three to six carbon atoms. [0099] In a further embodiment, R1 is straight- or branched-chain alkyl containing from one to four carbon atoms, in another embodiment, one or two carbon atoms, optionally substituted by one group R3. [0100] In certain embodiments, R2 is isobutyl. In other embodiments, R2 is 2-hydroxyisobutyl. [0101] In one embodiment, X is oxygen or sulfur. In certain embodiments, X is oxygen. In further embodiments, X is sulfur. [0102] In certain embodiments R3 is selected from the group consisting of halogen, hydroxy, carboxyl, alkoxycarbonyl, —NR4R5 and —NR6(CH2)mNR4R5. [0103] R3 is hydroxy or —NR4R5, wherein R4 and R5, which may be the same or different, each represent hydrogen or straight- or branched-chain alkyl containing from one to six carbon atoms or from one to four carbon atoms. In a further embodiment, R3 is —NR4R5. [0104] In certain embodiments, when X is sulfur, R1 is selected from the group consisting of N,N-dimethylaminoethyl, N,N-diethylaminoethyl, N-methyl-N-tert-butylaminoethyl and N-ethyl-N-tert-butylaminoethyl. [0105] In certain embodiments, X is sulfur, R2 is isobutyl and R1 is selected from the group consisting of N,N-dimethylaminoethyl, N,N-diethylaminoethyl, N-methyl-N-tert-butylaminoethyl and N-ethyl-N-tert-butylaminoethyl. [0106] In certain embodiments, X is sulfur, R2 is 2-hydroxyisobutyl and R1 is selected from the group consisting of N,N-dimethylaminoethyl, N,N-diethylaminoethyl, N-methyl-N-tert-butylaminoethyl and N-ethyl-N-tert-butylaminoethyl. [0107] Further compounds of formula (I) are those in which R1 is straight- or branched chain alkyl containing from two to six carbon atoms optionally substituted by a group R3; or straight- or branched chain alkenyl containing from two to four carbon atoms; and R3 is hydroxy, —NR4R5 or methoxy. [0108] Further compounds of formula (I) are those in which each of R4 and R5, which may be the same or different, is hydrogen; straight- or branched-chain alkyl comprising from one to four carbon atoms, or R4 and R5, together with the nitrogen atom to which they are attached, form a saturated ring containing six ring atoms; the ring atoms other than the nitrogen atom being independently selected from carbon and oxygen. [0109] In a further embodiment, R3 is selected from the group consisting of halogen, hydroxy, carboxyl, alkoxycarbonyl, —NR4R5 and —NR6(CH2)mNR4R5. The variable m can be an integer from two to four. [0110] In certain embodiments, halogen is fluoro, chloro or bromo. In one embodiment, halogen is fluoro or chloro. [0111] In one embodiment, compounds of formula (I) in which X is oxygen and R1 is 2-methoxyethyl, or pharmaceutically acceptable salts thereof are used in the methods and compositions provided herein. [0112] In another embodiment, compounds of formula (I) in which X is oxygen or sulfur and R1 is propyl substituted by —NR4R5 or methoxy, or pharmaceutically acceptable salts thereof are used in the methods and compositions provided herein. [0113] Among the compounds used in the methods and compositions of the present invention, are the cyclosporin derivatives listed below: 3-methoxycyclosporin; 3-ethoxycyclosporin; 3-propoxycyclosporin; 3-isopropoxycyclosporin; 3-(2-aminoethoxy)cyclosporin; 3-(2-N-methylaminoethoxy)cyclosporin; 3-(2-N-ethylaminoethoxy)cyclosporin; 3-(2-dimethylaminoethoxy)cyclosporin; 3-(2-diethylaminoethoxy)cyclosporin; 3-(2-tert-butyl-methylaminoethoxy)cyclosporin; 3-(2-tert-butyl-ethylaminoethoxy)cyclosporin; 3-[(R)-2-(N,N-dimethylamino)ethylthio-Sar]-4-[4′-hydroxy-MeLeu]-cyclosporin; 3-[(R)-2-(N,N-dimethylamino)ethylthio-Sar]-cyclosporin; 3-[(R)-2-(hydroxy)ethylthio-Sar]-4-[4′-hydroxy-MeLeu]-cyclosporin; 3-[(R)-2-(hydroxy)ethylthio-Sar]-cyclosporin; 3-[(R)-2-(N,N-diethylamino)ethylthio-Sar]-4-[4′-hydroxy-MeLeu]-cyclosporin; 3-[(R)-2-(N,N-diethylamino)ethylthio-Sar]-cyclosporin; 3-(sec-butoxy)cyclosporin; 3-[2-(1,4-dihydropyrid-1-yl)ethoxy)cyclosporin; and their pharmaceutically acceptable salts. [0133] In certain embodiments, compounds useful in the methods and compositions of the invention include the following: Compound Name A 3-methoxycyclosporin B 3-(2-aminoethoxy)cyclosporin C 3-(2-N,N-dimethylaminoethoxy)cyclosporin D 3-(isopropoxy)cyclosporin E 3-(2-ethylbutoxy)cyclosporin F 3-(2,2-dimethylpropoxy)cyclosporin G 3-(2-hydroxyethoxy)cyclosporin H 3-(3-hydroxypropoxy)cyclosporin I 3-[2-(N-methylamino)ethoxy]cyclosporin J 3-[2-(N-methyl-N-isopropylamino)ethoxy]cyclosporin K 3-[2-(piperidin-1-yl)ethoxy]cyclosporin L 3-[2-(N-morpholine)ethoxy)cyclosporin M 3-ethoxycyclosporin N 3-(2-methoxyethylthio)-4- (gamma-hydroxymethylleucine)cyclosporin O 3-[(R)-2-(N,N-dimethylamino)ethylthio-Sar]-4- (gamma-hydroxymethylleucine)cyclosporin P 3-ethylthiocyclosporin Q 3-propenylthiocyclosporin R 3-[(2-methoxy)ethylthio]cyclosporin S 3-(methylthio)-4-(gamma- hydroxymethylleucine)cyclosporin T 3-(methoxy)-4-(gamma-hydroxymethylleucine)cyclosporin U 3-(prop-2-ene-1-oxy)-4-(gamma- hydroxymethylleucine)cyclosporin V 3-(isopropoxy)-4-(gamma- hydroxymethylleucine)cyclosporin W 3-(ethoxy)-4-(gamma-hydroxymethylleucine)cyclosporin X 3-[2-(methoxy)ethoxy]-4- (gamma-hydroxymethylleucine)cyclosporin Y 3-[3-(methoxy)propoxy]-4- (gamma-hydroxymethylleucine)cyclosporin [0134] In particular embodiments, the present invention provides a method of treating or preventing hepatitis C virus infection in a subject by administering, to a subject in need thereof, an effective amount of a compound of the invention selected from the group consisting of compounds A to Y, or a pharmaceutically acceptable salt thereof, and an effective amount of a second agent as described below. [0135] In one embodiment, the compound is Compound O, or a pharmaceutically acceptable salt thereof, due to its high level of activity and its toxicological profile, as described in the examples below. [0136] In another embodiment, the methods and compositions provided herein use Compounds C and T, or pharmaceutically acceptable salts thereof. [0137] In certain embodiments, cyclosporin derivatives according to the invention in which R1 is alkyl substituted by one or more groups R3, where R3 is —NR4R5 or —NR6(CH2)mNR4R5 and R4, R5 and R6 are as defined above, can be converted into addition salts with acids by known methods. It is understood that these salts also come within the scope of the present invention. Exemplary salts of the invention, and methods of their preparation, are described in the sections below. [0138] Mention may be made, as examples of pharmaceutically acceptable salts, of the salts with alkali metals, e.g., sodium, potassium or lithium, or with alkaline-earth metals, e.g., magnesium or calcium, the ammonium salt or the salts of nitrogenous bases, e.g., ethanolamine, diethanolamine, trimethylamine, triethylamine, methylamine, propylamine, diisopropylamine, N,N-dimethylethanolamine, benzylamine, dicyclohexylamine, N-benzylphenethylamine, N,N′-dibenzylethylenediamine, diphenylenediamine, benzhydrylamine, quinine, choline, arginine, lysine, leucine or dibenzylamine. [0139] Mention may be made, as examples of addition salts with pharmaceutically acceptable acids, of the salts formed with inorganic acids, e.g., hydrochlorides, hydrobromides, sulfates, nitrates or phosphates, or with organic acids, e.g., succinates, fumarates, tartrates, acetates, propionates, maleates, citrates, methanesulfonates, ethanesulfonates, p-toluenesulfonates, isethionates or embonates, or with substitution derivatives of these compounds. Preferred salts are succinate, phosphate, citrate, acetate, hydrochlorides, methanesulfonate and propionate. Certain of these salts are novel and as such constitute a further feature of the present invention. [0140] In useful embodiments of the invention, the compound is in a pure form. Purity can be any purity known to those of skill in the art such as absolute purity, stereochemical purity or both. In certain embodiments, the compound of the invention is at least 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% pure. In certain embodiments, the compound of the invention is at least 90% pure. In further embodiments, of the invention, the compound is at least 98% pure. Methods of purifying compounds of the invention are described below. [0141] 5.2.2 Preparation of Compounds of the Invention [0142] The compounds of the invention can be prepared, isolated or obtained by any method apparent to those of skill in the art. Exemplary methods of preparation are described in detail in the examples below. [0143] In addition, cyclosporins substituted in the 3-position by thioether or ether groups can be prepared according to methods described in U.S. Pat. Nos. 5,977,067; 5,994,299, 5,948,884 and 6,583,265 and in PCT publication nos. WO99/32512, WO99/67280. The contents of these references are hereby incorporated by reference in their entireties. [0144] Compounds can be purified after synthesis by any technique apparent to those of skill in the art for purifying cyclosporin derivatives. In certain embodiments, a compound of the invention is purified by chromatography. For instance, a compound of the invention can be purified using high-performance liquid chromatography (HPLC). An useful example of the HPLC purification is as follows: An HPLC column of dimensions 10 mm (d)×50 mm (1) containing a 5-μm reverse-phase stationary phase (octadecyl-silane or octa-silane) is equilibrated with a mobile phase comprising 0.1% formic acid, 50 to 90% water, and 50 to 10% acetonitrile. Importantly, the column is heated to at least 65° C., or potentially up to 85° C. The mobile phase flows at 10 to 16 mL/minute and is heated to 60° C. Approximately 5 to 25 mg of a cyclosporin derivative is loaded on the column in 0.1 to 0.8 mL of a solvent, preferably dimethylsulfoxide. The mobile phase flow is maintained, and its composition is adjusted in a linear gradient up to 90% or 100% acetonitrile over a period of 20 to 60 minutes. Compound peaks are detected using evaporative light scattering detection and/or variable-ultraviolet detection at a wavelength setting of 205 to 215 nm. Compound peaks are collected in the mobile phase which is removed in vacuo; samples are thoroughly dried in vacuo and analyzed by NMR, IR, and HPLC-MS to determine identity and purity. [0145] 5.2.3 Pharmaceutical Salts of Compounds of the Invention [0146] As discussed above, a cyclosporin derivative of the invention can be in a neutral form, or in a salt form. The salt form can be any salt form known to those of skill in the art. Particularly useful salt forms are those that are coordinated with phosphate, citrate, acetate, chloride, methanesulfonate or propionate. [0147] Where a compound of the present invention, e.g. a compound of the invention, is substituted with a basic moiety, an acid addition salt can be formed. The acid which can be used to prepare an acid addition salt includes preferably that which produces, when combined with the free base, a pharmaceutically acceptable salt, that is, a salt whose anion is non-toxic to a subject in the pharmaceutical doses of the salt. Pharmaceutically acceptable salts within the scope of the invention are those derived from the following acids: mineral acids such as hyrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, sulfamic acid and nitric acid; and organic acids such as acetic, trifluoroacetic, trichloroacetic, propionic, hexanoic, cyclopentylpropionic, glycolic, glutaric, pyruvic, lactic, malonic, succinic, sorbic, ascorbic, malic, maleic, fumaric, tartaric, citric, benzoic, 3-(4-hydroxybenzoyl)benzoic, picric, cinnamic, mandelic, phthalic, lauric, methanesulfonic, ethanesulfonic, 1,2-ethane-disulfonic, 2-hydroxyethanesulfonic, benzenesulfonic, 4-chlorobenzenesulfonic, 2-naphthalenesulfonic, 4-toluenesulfonic, camphoric, camphorsulfonic, 4-methylbicyclo[2.2.2]-oct-2-ene-1-carboxylic, glucoheptonic, 3-phenylpropionic, trimethylacetic, tert-butylacetic, lauryl sulfuric, gluconic, benzoic, glutamic, hydroxynaphthoic, salicylic, stearic, cyclohexylsulfamic, quinic, muconic acid and the like acids. [0148] The corresponding acid addition salts include hydrohalides, e.g. hydrochloride and hydrobromide, sulfate, phosphate, sulfamate, nitrate, acetate, trifluoroacetate, trichloroacetate, propionate, hexanoate, cyclopentylpropionate, glycolate, glutarate, pyruvate, lactate, malonate, succinate, sorbate, ascorbate, malate, maleate, fumarate, tartarate, citrate, benzoate, 3-(4-hydroxybenzoyl)benzoate, picrate, cinnamate, mandelate, phthalate, laurate, methanesulfonate (mesylate), ethanesulfonate, 1,2-ethane-disulfonate, 2-hydroxyethanesulfonate, benzenesulfonate (besylate), 4-chlorobenzenesulfonate, 2-naphthalenesulfonate, 4-toluenesulfonate, camphorate, camphorsulfonate, 4-methylbicyclo[2.2.2]-oct-2-ene-1-carboxylate, glucoheptonate, 3-phenylpropionate, trimethylacetate, tert-butylacetate, lauryl sulfate, gluconate, benzoate, glutamate, hydroxynaphthoate, salicylate, stearate, cyclohexylsulfamate, quinate, muconate and the like. [0149] According to a further feature of the invention, acid addition salts of the compounds of this invention can be prepared by reaction of the free base with the appropriate acid, by the application or adaptation of known methods. For example, the acid addition salts of the compounds of this invention can be prepared either by dissolving the free base in aqueous or aqueous-alcohol solution or other suitable solvents containing the appropriate acid and isolating the salt by evaporating the solution, or by reacting the free base and acid in an organic solvent, in which case the salt separates directly or can be obtained by concentration of the solution. [0150] The acid addition salts of the compounds of this invention, e.g. compounds of the invention, can be regenerated from the salts by the application or adaptation of known methods. For example, parent compounds of the invention can be regenerated from their acid addition salts by treatment with an alkali, e.g., aqueous sodium bicarbonate solution or aqueous ammonia solution. [0151] Where a compound of the invention, e.g. a compound of the invention, is substituted with an acid moiety, base addition salts can be formed. Pharmaceutically acceptable salts, including for example alkali and alkaline earth metal salts, within the scope of the invention are those derived from the following bases: sodium hydride, sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, lithium hydroxide, zinc hydroxide, barium hydroxide, and organic amines such as aliphatic, alicyclic, or aromatic organic amines, such as ammonia, methylamine, dimethylamine, diethylamine, picoline, ethanolamine, diethanolamine, triethanolamine, ethylenediamine, lysine, arginine, ornithine, choline, N,N′-dibenzylethylene-diamine, chloroprocaine, diethanolamine, procaine, N-benzylphenethylamine, N-methylglucamine piperazine, tris(hydroxymethyl)-aminomethane, tetramethylammonium hydroxide, and the like. [0152] Metal salts of compounds of the present invention, e.g. compounds of the invention, can be obtained by contacting a hydride, hydroxide, carbonate or similar reactive compound of the chosen metal in an aqueous or organic solvent with the free acid form of the compound. The aqueous solvent employed may be water or it may be a mixture of water with an organic solvent, for example, an alcohol such as methanol or ethanol, a ketone such as acetone, an aliphatic ether such as tetrahydrofuran, or an ester such as ethyl acetate. Such reactions are normally conducted at ambient temperature but they may, if desired, be conducted with heating. [0153] Amine salts of compounds of the present invention, e.g. compounds of the invention, can be obtained by contacting an amine in an aqueous or organic solvent with the free acid form of the compound. Suitable aqueous solvents include water and mixtures of water with alcohols such as methanol or ethanol, ethers such as tetrahydrofuran, nitriles, such as acetonitrile, or ketones such as acetone. Amino acid salts may be similarly prepared. [0154] The base addition salts of the compounds of this invention, e.g. compounds of the invention, can be regenerated from the salts by the application or adaptation of known methods. For example, parent compounds of the invention can be regenerated from their base addition salts by treatment with an acid, e.g., hydrochloric acid. [0155] 5.3 Second Agents Useful in the Methods of the Invention [0156] The present invention provides methods of treatment of prevention that comprise the administration of a second agent effective for the treatment or prevention of HCV infection in a subject in need thereof. The second agent can be any agent known to those of skill in the art to be effective for the treatment or prevention of the HCV infection. The second agent can be a second agent presently known to those of skill in the art, or the second agent can be second agent later developed for the treatment or prevention of HCV. In certain embodiments, the second agent is presently approved for the treatment or prevention of HCV. [0157] In certain embodiments, a compound of the invention is administered in combination with one second agent. In further embodiments, a second agent is administered in combination with two second agents. In still further embodiments, a second agent is administered in combination with two or more second agents. [0158] Suitable second agents include small-molecule, orally bioavailable inhibitors of the HCV enzymes, nucleic-acid-based agents that attack viral RNA, agents that can modulate the host immune response. Exemplary second agents include: (i) current approved therapies (peg-interferon plus ribavirin), (ii) HCV-enzyme targeted compounds, (iii) viral-genome-targeted therapies (e.g., RNA interference or RNAi), and (iv) immunomodulatory agents such as ribavirin, interferon (INF) and Toll-receptor agonists. [0159] In certain embodiments, the second agent is a modulator of the NS3-4A protease. The NS3-4A protease is a heterodimeric protease, comprising the amino-terminal domain of the NS3 protein and the small NS4A cofactor. Its activity is essential for the generation of components of the viral RNA replication complex. [0160] One useful NS3-4A protease inhibitor is BILN 2061 (Ciluprevir; Boehringer Ingelheim), a macrocyclic mimic of peptide product inhibitors. Although clinical trials with BILN 2061 were halted (preclinical cardiotoxicity), it was the first NS3 inhibitor to be tested in humans. See Lamarre et al., 2003, Nature 426:186-189, the contents of which are hereby incorporated by reference in their entirety. [0161] Another useful NS3-4A protease inhibitor is VX-950 (Vertex/Mitsubishi), a protease-cleavage-product-derived peptidomimetic inhibitor of the NS3-4A protease. It is believed to be stabilized into the enzyme's active site through a ketoamide. See, e.g. Lin et al., 2005, J Biol Chem., Vol. 280(44) pp. 36784-36791, 2005, manuscript M506462200 (epublication); Summa, 2005, Curr Opin Investig Drugs. 6:831-7, the contents of which are hereby incorporated by reference in their entireties. [0162] Further useful NS3-4A protease inhibitor that are ketoamide inhibitors include those disclosed in U.S. Ser. No. 09/908,955, published as US 2004/0254117, the contents of which are hereby incorporated by reference in their entirety. Among the compounds disclosed therein is (1R, 2S, 5S)-3-azabicyclo[3,1,0]hexane-2-carboxamide,N-[3-amino-1-cyclobutylmethyl)-2,3-dioxopropyl]-3-[(2S)-2-[[[1,1-dimethylethyl]amino]carbonylamino]-3,3-dimethyl-1-oxobutyl]-6,6-dimethyl, known as SCH503034. Another ketoamide inhibitor of NS3-4A protease is 1,1-dimethylethyl[1(S)-[[(1R,5S)-2(S)-[[[1-(cyclopropylmethyl)-3-[[2-[[2-(dimethylamino)-2-oxo-1(S)-phenylethyl]-amino]-2-oxoethyl]amino]-2,3-dioxopropyl]amino]carbonyl]-6,6-dimethyl-3-azabicyclo[3.1.0]hexan-3-yl]carbonyl]-2,2-dimethylpropyl]carbamate, known as SCH6 (also known as SCH 446211). [0163] In certain embodiments, the second agent is a modulator of the HCV NS5B The RNA-dependent RNA polymerase (RdRp). Contained within the NS5B protein, RdRp synthesizes RNA using an RNA template. This biochemical activity is not present in mammalian cells. [0164] One useful modulator of RdRp is NM283 (Valopicitabine; Idenix/Novartis). NM283, is an oral prodrug (valine ester) of NM107 (2′-C-methyl-cytidine) in phase II trials for the treatment or prevention of HCV infection. See, e.g., U.S. Patent Application Publication No. 20040077587, the contents of which are hereby incorporated by reference in their entirety. [0165] Other useful modulators of RdRp include 7-deaza nucleoside analogs. For instance, 7-Deaza-2′-C-methyl-adenosine is a potent and selective inhibitor of hepatitis C virus replication with excellent pharmacokinetic properties. Olsen et al., 2004, Antimicrob. Agents Chemother. 48:3944-3953, the contents of which are hereby incorporated by reference in their entirety. [0166] In further embodiments, the second agent is a non-nucleoside modulator of NS5B. At least three different classes of non-nucleoside inhibitors (NNI) of NS5B inhibitors are being evaluated in the clinic. [0167] Useful non-nucleoside modulators of NS5B include JTK-003 and JTK-009. JTK-003 has been advanced to phase II. Useful non-nucleoside modulators of NS5B include the 6,5-fused heterocyclic compounds based on a benzimidazole or indole core. See, e.g., Hashimoto et al., WO 00147883, the contents of which are hereby incorporated by reference in their entirety. [0168] Further useful polymerase NNIs include R803 (Rigel) and HCV-371, HCV-086 and HCV-796 (ViroPharma/Wyeth). Additional useful NNIs include thiophene derivatives that are reversible allosteric inhibitors of the NS5B polymerase and bind to a site that is close to, but distinct from, the site occupied by benzimidazole-based inhibitors. See, e.g., Biswal, et al., 2005, J. Biol. Chem. 280, 18202-18210 (2005). [0169] Further useful NNIs for the methods of the invention include benzothiadiazines, such as benzo-1,2,4-thiadiazines. Derivatives of benzo-1,2,4-thiadiazine have been shown to be highly selective inhibitors of the HCV RNA polymerase. Dhanak, et al., 2002, J. Biol. Chem. 277:38322-38327, the contents of which are hereby incorporated by reference in their entirety. [0170] Further useful NNIs for the methods of the invention, and their mechanisms, are described in LaPlante et al., 2004 Angew Chem. Int. Ed. Engl. 43:4306-4311; Tomei et al., 2003, J. Virol. 77:13225-13231; Di Marco et al., 2005, J. Biol. Chem. 280:29765-70; Lu, H., WO 2005/000308; Chan et al., 2004, Bioorg. Med. Chem. Lett. 14:797-800; Chan et al., 2004, Bioorg. Med. Chem. Lett. 14:793-796; Wang et al., 2003, J. Biol. Chem. 278:9489-9495; Love, et al., 2003, J. Virol. 77:7575-7581; Gu et al., 2003, J. Biol. Chem. 278:16602-16607; Tomei et al., 2004, J. Virol. 78:938-946; and Nguyen et al., 2003, Antimicrob. Agents Chemother. 47:3525-3530; the contents of each are hereby incorporated by reference in their entireties. [0171] In a further embodiment, the second agent is an agent that is capable of interfering with HCV RNA such as small inhibitory RNA (siRNA) or a short hairpin RNA (shRNA) directed to an HCV polynucleotide. In tissue culture, siRNA and vector-encoded short hairpin RNA shRNA directed against the viral genome, effectively block the replication of HCV replicons. See, e.g., Randall et al., 2003, Proc. Natl. Acad. Sci. USA 100:235-240, the contents of which are hereby incorporated by reference in their entirety. [0172] In a further embodiment, the second agent is an agent that modulates the subject's immune response. For instance, in certain embodiments, the second agent can be a presently approved therapy for HCV infection such as an interferon (IFN), a pegylated IFN, an IFN plus ribavirin or a pegylated IFN plus ribavirin. In one embodiment, interferons include IFNα, IFNα2a and IFNα2b, and particularly pegylated IFNα2a (PEGASYS®) Or pegylated IFNα2b (PEG-INTRON®). In certain embodiments the second agent can be a reversible inhibitor of inosine monophosphate dehydrogenase (IMPDH), such as mycophenloic acid or a derivative thereof e.g. mycophenylate mofetil (CELLCEPT®). Another example of an IMPDH inhibitor is merimepodib, [(3S)-oxolan-3-yl]N-[[3-[[3-methoxy-4-(1,3-oxazol-5-yl)phenyl]carbamoylamino]phenyl]methyl]carbamate (known as VX-497). [0173] In a further embodiment, the second agent is a modulator of a Toll-like receptors (TLR). It is believed that TLRs are targets for stimulating innate anti-viral response. Suitable TLRs include, bur are not limited to, TLR3, TLR7, TLR8 and TLR9. It is believed that toll-like receptors sense the presence of invading microorganisms such as bacteria, viruses and parasites. They are expressed by immune cells, including macrophages, monocytes, dendritic cells and B cells. Stimulation or activation of TLRs can initiate acute inflammatory responses by induction of antimicrobial genes and pro-inflammatory cytokines and chemokines. [0174] In certain embodiments, the second agent is a polynucleotide comprising a CpG motif. Synthetic oligonucleotides containing unmethylated CpG motifs are potent agonists of TLR-9. Stimulation of dendritic cells with these oligonucleotides results in the production of tumour necrosis factor-alpha, interleukin-12 and IFN-alpha. TLR-9 ligands are also potent stimulators of B-cell proliferation and antibody secretion. One useful CpG-containing oligonucleotide is CPG-10101 (Actilon; Coley Pharmaceutical Group) which has been evaluated in the clinic. [0175] Another useful modulator of a TLR is ANA975 (Anadys). ANA975 is believed to act through TLR-7, and is known to elicit a powerful anti-viral response via induction and the release of inflammatory cytokines such as IFN-alpha. [0176] In another embodiment, the second agent is Celgosivir. Celgosivir is an alpha-glucosidase I inhibitor and acts through host-directed glycosylation. In preclinical studies, celgosivir has demonstrated strong synergy with IFNα plus ribavirin. See, e.g., Whitby et al., 2004, Antivir Chem Chemother. 15(3):141-51. Celgosivir is currently being evaluated in a Phase II monotherapy study in chronic HCV patients in Canada. [0177] Further immunomodulatory agents, and their mechanisms or targets, are described in Schetter & Vollmer, 2004, Curr. Opin. Drug Discov. Dev. 7:204-210; Takeda et al., 2003, Annu. Rev. Immunol. 21:335-376; Lee et al., 2003, Proc. Natl. Acad. Sci. USA 100:6646-6651; Hosmans et al., 2004, Hepatology 40 (Suppl. 1), 282A; and U.S. Pat. No. 6,924,271; the contents of each are hereby incorporated by reference in their entireties. [0178] In another embodiment, the second agent is Celgosivir. Celgosivir is an alpha-glucosidase I inhibitor and acts through host-directed glycosylation. In preclinical studies, celgosivir has demonstrated strong synergy with IFNα plus ribavirin. See, e.g., Whitby et al., 2004, Antivir Chem Chemother. 15(3):141-51. Celgosivir is currently being evaluated in a Phase II monotherapy study in chronic HCV patients in Canada. [0179] In another embodiment, the second agent is ursodeoxycholic acid, or a derivative thereof (such as tauroursodeoxycholic acid, a taurine conjugate of ursodeoxycholic acid). Ursodeoxycholic acid is known to be highly effective hepatitis C virus proliferation inhibitor which gives no adverse reaction, see for example U.S. Pat. Nos. 5,846,964 and 5,863,550, the contents of each are hereby incorporated by reference in their entireties. [0180] 5.4 Pharmaceutical Compositions and Methods of Administration [0181] The cyclosporin derivatives used in the methods of the present invention are preferably provided using pharmaceutical compositions containing at least one compound of general formula (I), if appropriate in the salt form, either used alone or in the form of a combination with one or more compatible and pharmaceutically acceptable carriers, such as diluents or adjuvants, or with another anti-HCV agent. [0182] In certain embodiments, the second agent of the invention can be formulated or packaged with the cyclosporin derivatives of the invention. Of course, the second agent will only be formulated with the cyclosporin derivative of the present invention when, according to the judgment of those of skill in the art, such co-formulation should not interfere with the activity of either agent or the method of administration. In certain embodiments, the cyclosporin derivative of the invention and the second agent are formulated separately. They can be packaged together, or packaged separately, for the convenience of the practitioner of skill in the art. [0183] In clinical practice the active agents of the present invention may be administered by any conventional route, in particular orally, parenterally, rectally or by inhalation (e.g. in the form of aerosols). In certain embodiments, the cyclosporin derivatives of the present invention are administered orally. [0184] Use may be made, as solid compositions for oral administration, of tablets, pills, hard gelatin capsules, powders or granules. In these compositions, the active product according to the invention is mixed with one or more inert diluents or adjuvants, such as sucrose, lactose or starch. [0185] These compositions can comprise substances other than diluents, for example a lubricant, such as magnesium stearate, or a coating intended for controlled release [0186] Use may be made, as liquid compositions for oral administration, of solutions which are pharmaceutically acceptable, suspensions, emulsions, syrups and elixirs containing inert diluents, such as water or liquid paraffin. These compositions can also comprise substances other than diluents, for example wetting, sweetening or flavoring products. [0187] The compositions for parenteral administration can be emulsions or sterile solutions. Use may be made, as solvent or vehicle, of propylene glycol, a polyethylene glycol, vegetable oils, in particular olive oil, or injectable organic esters, for example ethyl oleate. These compositions can also contain adjuvants, in particular wetting, isotonizing, emulsifying, dispersing and stabilizing agents. Sterilization can be carried out in several ways, for example using a bacteriological filter, by radiation or by heating. They can also be prepared in the form of sterile solid compositions which can be dissolved at the time of use in sterile water or any other injectable sterile medium. [0188] The compositions for rectal administration are suppositories or rectal capsules which contain, in addition to the active principle, excipients such as cocoa butter, semi-synthetic glycerides or polyethylene glycols. [0189] The compositions can also be aerosols. For use in the form of liquid aerosols, the compositions can be stable sterile solutions or solid compositions dissolved at the time of use in apyrogenic sterile water, in saline or any other pharmaceutically acceptable vehicle. For use in the form of dry aerosols intended to be directly inhaled, the active principle is finely divided and combined with a water-soluble solid diluent or vehicle, for example dextran, mannitol or lactose. [0190] In one embodiment, a composition of the invention is a pharmaceutical composition or a single unit dosage form. Pharmaceutical compositions and single unit dosage forms of the invention comprise a prophylactically or therapeutically effective amount of one or more prophylactic or therapeutic agents (e.g., a compound of the invention, or other prophylactic or therapeutic agent), and a typically one or more pharmaceutically acceptable carriers or excipients. In a specific embodiment and in this context, the term “pharmaceutically acceptable” means approved by a regulatory agency of the Federal or a state government or listed in the U.S. Pharmacopeia or other generally recognized pharmacopeia for use in animals, and more particularly in humans. The term “carrier” refers to a diluent, adjuvant (e.g., Freund's adjuvant (complete and incomplete)), excipient, or vehicle with which the therapeutic is administered. Such pharmaceutical carriers can be sterile liquids, such as water and oils, including those of petroleum, animal, vegetable or synthetic origin, such as peanut oil, soybean oil, mineral oil, sesame oil and the like. Water is a preferred carrier when the pharmaceutical composition is administered intravenously. Saline solutions and aqueous dextrose and glycerol solutions can also be employed as liquid carriers, particularly for injectable solutions. Examples of suitable pharmaceutical carriers are described in “Remington's Pharmaceutical Sciences” by E.W. Martin. [0191] Typical pharmaceutical compositions and dosage forms comprise one or more excipients. Suitable excipients are well-known to those skilled in the art of pharmacy, and non limiting examples of suitable excipients include starch, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, sodium stearate, glycerol monostearate, talc, sodium chloride, dried skim milk, glycerol, propylene, glycol, water, ethanol and the like. Whether a particular excipient is suitable for incorporation into a pharmaceutical composition or dosage form depends on a variety of factors well known in the art including, but not limited to, the way in which the dosage form will be administered to a subject and the specific active ingredients in the dosage form. The composition or single unit dosage form, if desired, can also contain minor amounts of wetting or emulsifying agents, or pH buffering agents. [0192] Lactose free compositions of the invention can comprise excipients that are well known in the art and are listed, for example, in the U.S. Pharmocopia (USP) SP (XXI)/NF (XVI). In general, lactose free compositions comprise an active ingredient, a binder/filler, and a lubricant in pharmaceutically compatible and pharmaceutically acceptable amounts. Exemplary lactose free dosage forms comprise an active ingredient, microcrystalline cellulose, pre gelatinized starch, and magnesium stearate. [0193] This invention further encompasses anhydrous pharmaceutical compositions and dosage forms comprising active ingredients, since water can facilitate the degradation of some compounds. For example, the addition of water (e.g., 5%) is widely accepted in the pharmaceutical arts as a means of simulating long term storage in order to determine characteristics such as shelf life or the stability of formulations over time. See, e.g., Jens T. Carstensen, Drug Stability: Principles & Practice, 2d. Ed., Marcel Dekker, NY, N.Y., 1995, pp. 379 80. In effect, water and heat accelerate the decomposition of some compounds. Thus, the effect of water on a formulation can be of great significance since moisture and/or humidity are commonly encountered during manufacture, handling, packaging, storage, shipment, and use of formulations. [0194] Anhydrous pharmaceutical compositions and dosage forms of the invention can be prepared using anhydrous or low moisture containing ingredients and low moisture or low humidity conditions. Pharmaceutical compositions and dosage forms that comprise lactose and at least one active ingredient that comprises a primary or secondary amine are preferably anhydrous if substantial contact with moisture and/or humidity during manufacturing, packaging, and/or storage is expected. [0195] An anhydrous pharmaceutical composition should be prepared and stored such that its anhydrous nature is maintained. Accordingly, anhydrous compositions are preferably packaged using materials known to prevent exposure to water such that they can be included in suitable formulary kits. Examples of suitable packaging include, but are not limited to, hermetically sealed foils, plastics, unit dose containers (e.g., vials), blister packs, and strip packs. [0196] The invention further encompasses pharmaceutical compositions and dosage forms that comprise one or more compounds that reduce the rate by which an active ingredient will decompose. Such compounds, which are referred to herein as “stabilizers,” include, but are not limited to, antioxidants such as ascorbic acid, pH buffers, or salt buffers. [0197] The pharmaceutical compositions and single unit dosage forms can take the form of solutions, suspensions, emulsion, tablets, pills, capsules, powders, sustained-release formulations and the like. Oral formulation can include standard carriers such as pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharine, cellulose, magnesium carbonate, etc. Such compositions and dosage forms will contain a prophylactically or therapeutically effective amount of a prophylactic or therapeutic agent preferably in purified form, together with a suitable amount of carrier so as to provide the form for proper administration to the subject. The formulation should suit the mode of administration. In a certain embodiment, the pharmaceutical compositions or single unit dosage forms are sterile and in suitable form for administration to a subject, for example, an animal subject, such as a mammalian subject, for example, a human subject. [0198] A pharmaceutical composition of the invention is formulated to be compatible with its intended route of administration. Examples of routes of administration include, but are not limited to, parenteral, e.g., intravenous, intradermal, subcutaneous, intramuscular, subcutaneous, oral, buccal, sublingual, inhalation, intranasal, transdermal, topical, transmucosal, intra-tumoral, intra-synovial and rectal administration. In a specific embodiment, the composition is formulated in accordance with routine procedures as a pharmaceutical composition adapted for intravenous, subcutaneous, intramuscular, oral, intranasal or topical administration to human beings. In an embodiment, a pharmaceutical composition is formulated in accordance with routine procedures for subcutaneous administration to human beings. Typically, compositions for intravenous administration are solutions in sterile isotonic aqueous buffer. Where necessary, the composition may also include a solubilizing agent and a local anesthetic such as lignocamne to ease pain at the site of the injection. [0199] Examples of dosage forms include, but are not limited to: tablets; caplets; capsules, such as soft elastic gelatin capsules; cachets; troches; lozenges; dispersions; suppositories; ointments; cataplasms (poultices); pastes; powders; dressings; creams; plasters; solutions; patches; aerosols (e.g., nasal sprays or inhalers); gels; liquid dosage forms suitable for oral or mucosal administration to a subject, including suspensions (e.g., aqueous or non aqueous liquid suspensions, oil in water emulsions, or a water in oil liquid emulsions), solutions, and elixirs; liquid dosage forms suitable for parenteral administration to a subject; and sterile solids (e.g., crystalline or amorphous solids) that can be reconstituted to provide liquid dosage forms suitable for parenteral administration to a subject. [0200] The composition, shape, and type of dosage forms of the invention will typically vary depending on their use. For example, a dosage form used in the initial treatment of viral infection may contain larger amounts of one or more of the active ingredients it comprises than a dosage form used in the maintenance treatment of the same infection. Similarly, a parenteral dosage form may contain smaller amounts of one or more of the active ingredients it comprises than an oral dosage form used to treat the same disease or disorder. These and other ways in which specific dosage forms encompassed by this invention will vary from one another will be readily apparent to those skilled in the art. See, e.g., Remington's Pharmaceutical Sciences, 20th ed., Mack Publishing, Easton Pa. (2000). [0201] Generally, the ingredients of compositions of the invention are supplied either separately or mixed together in unit dosage form, for example, as a dry lyophilized powder or water free concentrate in a hermetically sealed container such as an ampoule or sachette indicating the quantity of active agent. Where the composition is to be administered by infusion, it can be dispensed with an infusion bottle containing sterile pharmaceutical grade water or saline. Where the composition is administered by injection, an ampoule of sterile water for injection or saline can be provided so that the ingredients may be mixed prior to administration. [0202] Typical dosage forms of the invention comprise a compound of the invention, or a pharmaceutically acceptable salt, solvate or hydrate thereof lie within the range of from about 0.1 mg to about 1000 mg per day, given as a single once-a-day dose in the morning or as divided doses throughout the day taken with food. Particular dosage forms of the invention have about 0.1, 0.2, 0.3, 0.4, 0.5, 1.0, 2.0, 2.5, 5.0, 10.0, 15.0, 20.0, 25.0, 50.0, 100, 200, 250, 500 or 1000 mg of the active cyclosporin. [0203] 5.4.1 Oral Dosage Forms [0204] Pharmaceutical compositions of the invention that are suitable for oral administration can be presented as discrete dosage forms, such as, but are not limited to, tablets (e.g., chewable tablets), caplets, capsules, and liquids (e.g., flavored syrups). Such dosage forms contain predetermined amounts of active ingredients, and may be prepared by methods of pharmacy well known to those skilled in the art. See generally, Remington's Pharmaceutical Sciences, 20th ed., Mack Publishing, Easton Pa. (2000). [0205] In certain embodiments, the oral dosage forms are solid and prepared under anhydrous conditions with anhydrous ingredients, as described in detail in the sections above. However, the scope of the invention extends beyond anhydrous, solid oral dosage forms. As such, further forms are described herein. [0206] Typical oral dosage forms of the invention are prepared by combining the active ingredient(s) in an intimate admixture with at least one excipient according to conventional pharmaceutical compounding techniques. Excipients can take a wide variety of forms depending on the form of preparation desired for administration. For example, excipients suitable for use in oral liquid or aerosol dosage forms include, but are not limited to, water, glycols, oils, alcohols, flavoring agents, preservatives, and coloring agents. Examples of excipients suitable for use in solid oral dosage forms (e.g., powders, tablets, capsules, and caplets) include, but are not limited to, starches, sugars, micro crystalline cellulose, diluents, granulating agents, lubricants, binders, and disintegrating agents. [0207] Because of their ease of administration, tablets and capsules represent the most advantageous oral dosage unit forms, in which case solid excipients are employed. If desired, tablets can be coated by standard aqueous or nonaqueous techniques. Such dosage forms can be prepared by any of the methods of pharmacy. In general, pharmaceutical compositions and dosage forms are prepared by uniformly and intimately admixing the active ingredients with liquid carriers, finely divided solid carriers, or both, and then shaping the product into the desired presentation if necessary. [0208] For example, a tablet can be prepared by compression or molding. Compressed tablets can be prepared by compressing in a suitable machine the active ingredients in a free flowing form such as powder or granules, optionally mixed with an excipient. Molded tablets can be made by molding in a suitable machine a mixture of the powdered compound moistened with an inert liquid diluent. [0209] Examples of excipients that can be used in oral dosage forms of the invention include, but are not limited to, binders, fillers, disintegrants, and lubricants. Binders suitable for use in pharmaceutical compositions and dosage forms include, but are not limited to, corn starch, potato starch, or other starches, gelatin, natural and synthetic gums such as acacia, sodium alginate, alginic acid, other alginates, powdered tragacanth, guar gum, cellulose and its derivatives (e.g., ethyl cellulose, cellulose acetate, carboxymethyl cellulose calcium, sodium carboxymethyl cellulose), polyvinyl pyrrolidone, methyl cellulose, pre gelatinized starch, hydroxypropyl methyl cellulose, (e.g., Nos. 2208, 2906, 2910), microcrystalline cellulose, and mixtures thereof. [0210] Examples of fillers suitable for use in the pharmaceutical compositions and dosage forms disclosed herein include, but are not limited to, talc, calcium carbonate (e.g., granules or powder), microcrystalline cellulose, powdered cellulose, dextrates, kaolin, mannitol, silicic acid, sorbitol, starch, pre gelatinized starch, and mixtures thereof. The binder or filler in pharmaceutical compositions of the invention is typically present in from about 50 to about 99 weight percent of the pharmaceutical composition or dosage form. [0211] Suitable forms of microcrystalline cellulose include, but are not limited to, the materials sold as AVICEL PH 101, AVICEL PH 103 AVICEL RC 581, AVICEL PH 105 (available from FMC Corporation, American Viscose Division, Avicel Sales, Marcus Hook, Pa.), and mixtures thereof. An specific binder is a mixture of microcrystalline cellulose and sodium carboxymethyl cellulose sold as AVICEL RC 581. Suitable anhydrous or low moisture excipients or additives include AVICEL PH 103™ and Starch 1500 LM. [0212] Disintegrants are used in the compositions of the invention to provide tablets that disintegrate when exposed to an aqueous environment. Tablets that contain too much disintegrant may disintegrate in storage, while those that contain too little may not disintegrate at a desired rate or under the desired conditions. Thus, a sufficient amount of disintegrant that is neither too much nor too little to detrimentally alter the release of the active ingredients should be used to form solid oral dosage forms of the invention. The amount of disintegrant used varies based upon the type of formulation, and is readily discernible to those of ordinary skill in the art. Typical pharmaceutical compositions comprise from about 0.5 to about 15 weight percent of disintegrant, specifically from about 1 to about 5 weight percent of disintegrant. [0213] Disintegrants that can be used in pharmaceutical compositions and dosage forms of the invention include, but are not limited to, agar agar, alginic acid, calcium carbonate, microcrystalline cellulose, croscarmellose sodium, crospovidone, polacrilin potassium, sodium starch glycolate, potato or tapioca starch, pre gelatinized starch, other starches, clays, other algins, other celluloses, gums, and mixtures thereof. [0214] Lubricants that can be used in pharmaceutical compositions and dosage forms of the invention include, but are not limited to, calcium stearate, magnesium stearate, mineral oil, light mineral oil, glycerin, sorbitol, mannitol, polyethylene glycol, other glycols, stearic acid, sodium lauryl sulfate, talc, hydrogenated vegetable oil (e.g., peanut oil, cottonseed oil, sunflower oil, sesame oil, olive oil, corn oil, and soybean oil), zinc stearate, ethyl oleate, ethyl laureate, agar, and mixtures thereof. Additional lubricants include, for example, a syloid silica gel (AEROSIL 200, manufactured by W.R. Grace Co. of Baltimore, Md.), a coagulated aerosol of synthetic silica (marketed by Degussa Co. of Plano, Tex.), CAB O SIL (a pyrogenic silicon dioxide product sold by Cabot Co. of Boston, Mass.), and mixtures thereof. If used at all, lubricants are typically used in an amount of less than about 1 weight percent of the pharmaceutical compositions or dosage forms into which they are incorporated. [0215] 5.4.2 Delayed Release Dosage Forms [0216] Active ingredients such as the compounds of the invention can be administered by controlled release means or by delivery devices that are well known to those of ordinary skill in the art. Examples include, but are not limited to, those described in U.S. Pat. Nos. 3,845,770; 3,916,899; 3,536,809; 3,598,123; and 4,008,719; 5,674,533; 5,059,595; 5,591,767; 5,120,548; 5,073,543; 5,639,476; 5,354,556; 5,639,480; 5,733,566; 5,739,108; 5,891,474; 5,922,356; 5,972,891; 5,980,945; 5,993,855; 6,045,830; 6,087,324; 6,113,943; 6,197,350; 6,248,363; 6,264,970; 6,267,981; 6,376,461; 6,419,961; 6,589,548; 6,613,358; 6,699,500 each of which is incorporated herein by reference. Such dosage forms can be used to provide slow or controlled release of one or more active ingredients using, for example, hydropropylmethyl cellulose, other polymer matrices, gels, permeable membranes, osmotic systems, multilayer coatings, microparticles, liposomes, microspheres, or a combination thereof to provide the desired release profile in varying proportions. Suitable controlled release formulations known to those of ordinary skill in the art, including those described herein, can be readily selected for use with the active ingredients of the invention. The invention thus encompasses single unit dosage forms suitable for oral administration such as, but not limited to, tablets, capsules, gelcaps, and caplets that are adapted for controlled release. [0217] All controlled release pharmaceutical products have a common goal of improving drug therapy over that achieved by their non controlled counterparts. Ideally, the use of an optimally designed controlled release preparation in medical treatment is characterized by a minimum of drug substance being employed to cure or control the condition in a minimum amount of time. Advantages of controlled release formulations include extended activity of the drug, reduced dosage frequency, and increased subject compliance. In addition, controlled release formulations can be used to affect the time of onset of action or other characteristics, such as blood levels of the drug, and can thus affect the occurrence of side (e.g., adverse) effects. [0218] Most controlled release formulations are designed to initially release an amount of drug (active ingredient) that promptly produces the desired therapeutic effect, and gradually and continually release of other amounts of drug to maintain this level of therapeutic or prophylactic effect over an extended period of time. In order to maintain this constant level of drug in the body, the drug must be released from the dosage form at a rate that will replace the amount of drug being metabolized and excreted from the body. Controlled release of an active ingredient can be stimulated by various conditions including, but not limited to, pH, temperature, enzymes, water, or other physiological conditions or compounds. [0219] In certain embodiments, the drug may be administered using intravenous infusion, an implantable osmotic pump, a transdermal patch, liposomes, or other modes of administration. In one embodiment, a pump may be used (see, Sefton, CRC Crit. Ref. Biomed. Eng. 14:201 (1987); Buchwald et al., Surgery 88:507 (1980); Saudek et al., N. Engl. J. Med. 321:574 (1989)). In another embodiment, polymeric materials can be used. In yet another embodiment, a controlled release system can be placed in a subject at an appropriate site determined by a practitioner of skill, i.e., thus requiring only a fraction of the systemic dose (see, e.g., Goodson, Medical Applications of Controlled Release, vol. 2, pp. 115-138 (1984)). Other controlled release systems are discussed in the review by Langer (Science 249:1527-1533 (1990)). The active ingredient can be dispersed in a solid inner matrix, e.g., polymethylmethacrylate, polybutylmethacrylate, plasticized or unplasticized polyvinylchloride, plasticized nylon, plasticized polyethyleneterephthalate, natural rubber, polyisoprene, polyisobutylene, polybutadiene, polyethylene, ethylene-vinylacetate copolymers, silicone rubbers, polydimethylsiloxanes, silicone carbonate copolymers, hydrophilic polymers such as hydrogels of esters of acrylic and methacrylic acid, collagen, cross-linked polyvinylalcohol and cross-linked partially hydrolyzed polyvinyl acetate, that is surrounded by an outer polymeric membrane, e.g., polyethylene, polypropylene, ethylene/propylene copolymers, ethylene/ethyl ac late copolymers, ethylene/vinylacetate copolymers, silicone rubbers, polydimethyl siloxanes, neoprene rubber, chlorinated polyethylene, polyvinylchloride, vinylchloride copolymers with vinyl acetate, vinylidene chloride, ethylene and propylene, ionomer polyethylene terephthalate, butyl rubber epichlorohydrin rubbers, ethylene/vinyl alcohol copolymer, ethylene/vinyl acetate/vinyl alcohol terpolymer, and ethylene/vinyloxyethanol copolymer, that is insoluble in body fluids. The active ingredient then diffuses through the outer polymeric membrane in a release rate controlling step. The percentage of active ingredient in such parenteral compositions is highly dependent on the specific nature thereof, as well as the needs of the subject. [0220] 5.4.3 Parenteral Dosage Forms [0221] Although solid, anhydrous oral dosage forms are preferred, the present invention also provides parenteral dosage forms. Parenteral dosage forms can be administered to subjects by various routes including, but not limited to, subcutaneous, intravenous (including bolus injection), intramuscular, and intraarterial. Because their administration typically bypasses subjects' natural defenses against contaminants, parenteral dosage forms are preferably sterile or capable of being sterilized prior to administration to a subject. Examples of parenteral dosage forms include, but are not limited to, solutions ready for injection, dry products ready to be dissolved or suspended in a pharmaceutically acceptable vehicle for injection, suspensions ready for injection, and emulsions. [0222] Suitable vehicles that can be used to provide parenteral dosage forms of the invention are well known to those skilled in the art. Examples include, but are not limited to: Water for Injection USP; aqueous vehicles such as, but not limited to, Sodium Chloride Injection, Ringer's Injection, Dextrose Injection, Dextrose and Sodium Chloride Injection, and Lactated Ringer's Injection; water miscible vehicles such as, but not limited to, ethyl alcohol, polyethylene glycol, and polypropylene glycol; and non aqueous vehicles such as, but not limited to, corn oil, cottonseed oil, peanut oil, sesame oil, ethyl oleate, isopropyl myristate, and benzyl benzoate. [0223] Compounds that increase the solubility of one or more of the active ingredients disclosed herein can also be incorporated into the parenteral dosage forms of the invention. [0224] 5.4.4 Transdermal, Topical & Mucosal Dosage Forms [0225] Although solid, anhydrous oral dosage forms are preferred, the present invention also provides transdermal, topical, and mucosal dosage forms. Transdermal, topical, and mucosal dosage forms of the invention include, but are not limited to, ophthalmic solutions, sprays, aerosols, creams, lotions, ointments, gels, solutions, emulsions, suspensions, or other forms known to one of skill in the art. See, e.g., Remington's Pharmaceutical Sciences, 16th, 18th and 20th eds., Mack Publishing, Easton Pa. (1980, 1990 & 2000); and Introduction to Pharmaceutical Dosage Forms, 4th ed., Lea & Febiger, Philadelphia (1985). Dosage forms suitable for treating mucosal tissues within the oral cavity can be formulated as mouthwashes or as oral gels. Further, transdermal dosage forms include “reservoir type” or “matrix type” patches, which can be applied to the skin and worn for a specific period of time to permit the penetration of a desired amount of active ingredients. [0226] Suitable excipients (e.g., carriers and diluents) and other materials that can be used to provide transdermal, topical, and mucosal dosage forms encompassed by this invention are well known to those skilled in the pharmaceutical arts, and depend on the particular tissue to which a given pharmaceutical composition or dosage form will be applied. With that fact in mind, typical excipients include, but are not limited to, water, acetone, ethanol, ethylene glycol, propylene glycol, butane 1,3 diol, isopropyl myristate, isopropyl palmitate, mineral oil, and mixtures thereof to form lotions, tinctures, creams, emulsions, gels or ointments, which are non toxic and pharmaceutically acceptable. Moisturizers or humectants can also be added to pharmaceutical compositions and dosage forms if desired. Examples of such additional ingredients are well known in the art. See, e.g., Remington's Pharmaceutical Sciences, 16th, 18th and 20th eds., Mack Publishing, Easton Pa. (1980, 1990 & 2000). [0227] Depending on the specific tissue to be treated, additional components may be used prior to, in conjunction with, or subsequent to treatment with active ingredients of the invention. For example, penetration enhancers can be used to assist in delivering the active ingredients to the tissue. Suitable penetration enhancers include, but are not limited to: acetone; various alcohols such as ethanol, oleyl, and tetrahydrofuryl; alkyl sulfoxides such as dimethyl sulfoxide; dimethyl acetamide; dimethyl formamide; polyethylene glycol; pyrrolidones such as polyvinylpyrrolidone; Kollidon grades (Povidone, Polyvidone); urea; and various water soluble or insoluble sugar esters such as Tween 80 (polysorbate 80) and Span 60 (sorbitan monostearate). [0228] The pH of a pharmaceutical composition or dosage form, or of the tissue to which the pharmaceutical composition or dosage form is applied, may also be adjusted to improve delivery of one or more active ingredients. Similarly, the polarity of a solvent carrier, its ionic strength, or tonicity can be adjusted to improve delivery. Compounds such as stearates can also be added to pharmaceutical compositions or dosage forms to advantageously alter the hydrophilicity or lipophilicity of one or more active ingredients so as to improve delivery. In this regard, stearates can serve as a lipid vehicle for the formulation, as an emulsifying agent or surfactant, and as a delivery enhancing or penetration enhancing agent. Different salts, hydrates or solvates of the active ingredients can be used to further adjust the properties of the resulting composition. [0229] 5.4.5 Dosage and Unit Dosage Forms [0230] In human therapeutics, the doctor will determine the posology which he considers most appropriate according to a preventive or curative treatment and according to the age, weight, stage of the infection and other factors specific to the subject to be treated. Generally, doses are from about 1 to about 1000 mg per day for an adult, or from about 5 to about 250 mg per day or from about 10 to 50 mg per day for an adult. In certain embodiments, doses are from about 5 to about 400 mg per day, and more preferably 25 to 200 mg per day per adult. Dose rates of from about 50 to about 500 mg per day are also preferred. [0231] In further aspects, the present invention provides methods of treating or preventing hepatitis C virus infection in a subject by administering, to a subject in need thereof, an effective amount of a compound of the invention, or a pharmaceutically acceptable salt thereof, with a high therapeutic index against hepatitis C virus. The therapeutic index can be measured according to any method known to those of skill in the art, such as the method described in the examples below. In certain embodiments, the therapeutic index is the ratio of a concentration at which the compound is toxic, to the concentration that is effective against hepatitis C virus. Toxicity can be measured by any technique known to those of skill including cytotoxicity (e.g. IC50 or IC90) and lethal dose (e.g. LD50 or LD90). Likewise, effective concentrations can be measured by any technique known to those of skill including effective concentration (e.g. EC50 or EC90) and effective dose (e.g. ED50 or ED90). Preferably, similar measurements are compared in the ratio (e.g. IC50/EC50, IC90/EC90, LD50/ED50 or LD90/ED90). In certain embodiments, the therapeutic index can be as high as 2.0, 5.0, 10.0, 15.0, 20.0, 25.0, 50.0, 75.0, 100.0, 125.0, 150.0 or higher. [0232] The amount of the compound or composition of the invention which will be effective in the prevention or treatment of a disorder or one or more symptoms thereof will vary with the nature and severity of the disease or condition, and the route by which the active ingredient is administered. The frequency and dosage will also vary according to factors specific for each subject depending on the specific therapy (e.g., therapeutic or prophylactic agents) administered, the severity of the disorder, disease, or condition, the route of administration, as well as age, body, weight, response, and the past medical history of the subject. Effective doses may be extrapolated from dose-response curves derived from in vitro or animal model test systems. [0233] Exemplary doses of a composition include milligram or microgram amounts of the active compound per kilogram of subject or sample weight (e.g., about 10 micrograms per kilogram to about 50 milligrams per kilogram, about 100 micrograms per kilogram to about 25 milligrams per kilogram, or about 100 microgram per kilogram to about 10 milligrams per kilogram). For compositions of the invention, the dosage administered to a subject is typically 0.140 mg/kg to 3 mg/kg of the subject's body weight, based on weight of the active compound. In certain embodiments, the dosage administered to a subject is between 0.20 mg/kg and 2.00 mg/kg, or between 0.30 mg/kg and 1.50 mg/kg of the subject's body weight. [0234] In general, the recommended daily dose range of a composition of the invention for the conditions described herein lie within the range of from about 0.1 mg to about 1000 mg per day, given as a single once-a-day dose or as divided doses throughout a day. In one embodiment, the daily dose is administered twice daily in equally divided doses. Specifically, a daily dose range should be from about 10 mg to about 200 mg per day, more specifically, between about 10 mg and about 150 mg per day, or even more specifically between about 25 and about 100 mg per day. It may be necessary to use dosages of the active ingredient outside the ranges disclosed herein in some cases, as will be apparent to those of ordinary skill in the art. Furthermore, it is noted that the clinician or treating physician will know how and when to interrupt, adjust, or terminate therapy in conjunction with subject response. [0235] Different therapeutically effective amounts may be applicable for different diseases and conditions, as will be readily known by those of ordinary skill in the art. Similarly, amounts sufficient to prevent, manage, treat or ameliorate such disorders, but insufficient to cause, or sufficient to reduce, adverse effects associated with the composition of the invention are also encompassed by the above described dosage amounts and dose frequency schedules. Further, when a subject is administered multiple dosages of a composition of the invention, not all of the dosages need be the same. For example, the dosage administered to the subject may be increased to improve the prophylactic or therapeutic effect of the composition or it may be decreased to reduce one or more side effects that a particular subject is experiencing. [0236] In a specific embodiment, the dosage of the composition of the invention or a composition of the invention, based on weight of the active compound, administered to prevent, treat, manage, or ameliorate a disorder, or one or more symptoms thereof in a subject is 0.1 mg/kg, 1 mg/kg, 2 mg/kg, 3 mg/kg, 4 mg/kg, 5 mg/kg, 6 mg/kg, 10 mg/kg, or 15 mg/kg or more of a subject's body weight. In another embodiment, the dosage of the composition of the invention or a composition of the invention administered to prevent, treat, manage, or ameliorate a disorder, or one or more symptoms thereof in a subject is a unit dose of 0.1 mg to 200 mg, 0.1 mg to 100 mg, 0.1 mg to 50 mg, 0.1 mg to 25 mg, 0.1 mg to 20 mg, 0.1 mg to 15 mg, 0.1 mg to 10 mg, 0.1 mg to 7.5 mg, 0.1 mg to 5 mg, 0.1 to 2.5 mg, 0.25 mg to 20 mg, 0.25 to 15 mg, 0.25 to 12 mg, 0.25 to 10 mg, 0.25 mg to 7.5 mg, 0.25 mg to 5 mg, 0.5 mg to 2.5 mg, 1 mg to 20 mg, 1 mg to 15 mg, 1 mg to 12 mg, 1 mg to 10 mg, 1 mg to 7.5 mg, 1 mg to 5 mg, or 1 mg to 2.5 mg. [0237] In certain embodiments, treatment or prevention can be initiated with one or more loading doses of a compound or composition of the invention followed by one or more maintenance doses. In such embodiments, the loading dose can be, for instance, about 60 to about 400 mg per day, or about 100 to about 200 mg per day for one day to five weeks. The loading dose can be followed by one or more maintenance doses. Each maintenance does can be, independently, about from about 10 mg to about 200 mg per day, more specifically, between about 25 mg and about 150 mg per day, or even more specifically between about 25 and about 80 mg per day. Maintenance doses are preferably administered daily and can be administered as single doses, or as divided doses. [0238] In certain embodiments, a dose of a compound or composition of the invention can be administered to achieve a steady-state concentration of the active ingredient in blood or serum of the subject. The steady-state concentration can be determined by measurement according to techniques available to those of skill or can be based on the physical characteristics of the subject such as height, weight and age. In certain embodiments, a sufficient amount of a compound or composition of the invention is administered to achieve a steady-state concentration in blood or serum of the subject of from about 300 to about 4000 ng/mL, from about 400 to about 1600 ng/mL, or from about 600 to about 1200 ng/mL. Loading doses can be administered to achieve steady-state blood or serum concentrations of about 1200 to about 8000 ng/mL, or about 2000 to about 4000 ng/mL for one to five days. Maintenance doses can be administered to achieve a steady-state concentration in blood or serum of the subject of from about 300 to about 4000 ng/mL, from about 400 to about 1600 ng/mL, or from about 600 to about 1200 ng/mL. [0239] In certain embodiments, administration of the same composition of the invention may be repeated and the administrations may be separated by at least 1 day, 2 days, 3 days, 5 days, 10 days, 15 days, 30 days, 45 days, 2 months, 75 days, 3 months, or 6 months. In other embodiments, administration of the same prophylactic or therapeutic agent may be repeated and the administration may be separated by at least at least 1 day, 2 days, 3 days, 5 days, 10 days, 15 days, 30 days, 45 days, 2 months, 75 days, 3 months, or 6 months. [0240] In certain aspects, the present invention provides unit dosages comprising a compound of the invention, or a pharmaceutically acceptable salt thereof, in a form suitable for administration. Such forms are described in detail above. In certain embodiments, the unit dosage comprises 1 to 1000 mg, 5 to 250 mg or 10 to 50 mg active ingredient. In particular embodiments, the unit dosages comprise about 1, 5, 10, 25, 50, 100, 125, 250, 500 or 1000 mg active ingredient. Such unit dosages can be prepared according to techniques familiar to those of skill in the art. [0241] The dosages of the second agents are to be used in the combination therapies of the invention. In certain embodiments, dosages lower than those which have been or are currently being used to prevent or treat HCV infection are used in the combination therapies of the invention. The recommended dosages of second agents can obtained from the knowledge of those of skill. For those second agents that are approved for clinical use, recommended dosages are described in, for example, Hardman et al., eds., 1996, Goodman & Gilman's The Pharmacological Basis Of Basis Of Therapeutics 9th Ed, Mc-Graw-Hill, N.Y.; Physician's Desk Reference (PDR) 57th Ed., 2003, Medical Economics Co., Inc., Montvale, N.J., which are incorporated herein by reference in its entirety. [0242] In various embodiments, the therapies (e.g., the cyclosporin derivative of the invention and the second agent) are administered less than 5 minutes apart, less than 30 minutes apart, 1 hour apart, at about 1 hour apart, at about 1 to about 2 hours apart, at about 2 hours to about 3 hours apart, at about 3 hours to about 4 hours apart, at about 4 hours to about 5 hours apart, at about 5 hours to about 6 hours apart, at about 6 hours to about 7 hours apart, at about 7 hours to about 8 hours apart, at about 8 hours to about 9 hours apart, at about 9 hours to about 10 hours apart, at about 10 hours to about 11 hours apart, at about 11 hours to about 12 hours apart, at about 12 hours to 18 hours apart, 18 hours to 24 hours apart, 24 hours to 36 hours apart, 36 hours to 48 hours apart, 48 hours to 52 hours apart, 52 hours to 60 hours apart, 60 hours to 72 hours apart, 72 hours to 84 hours apart, 84 hours to 96 hours apart, or 96 hours to 120 hours part. In certain embodiments, two or more therapies are administered within the same patent visit. [0243] In certain embodiments, the cyclosporin derivative of the invention and the second agent are cyclically administered. Cycling therapy involves the administration of a first therapy (e.g., a first prophylactic or therapeutic agents) for a period of time, followed by the administration of a second therapy (e.g., a second prophylactic or therapeutic agents) for a period of time, followed by the administration of a third therapy (e.g., a third prophylactic or therapeutic agents) for a period of time and so forth, and repeating this sequential administration, i.e., the cycle in order to reduce the development of resistance to one of the agents, to avoid or reduce the side effects of one of the agents, and/or to improve the efficacy of the treatment. [0244] In certain embodiments, administration of the same agent may be repeated and the administrations may be separated by at least 1 day, 2 days, 3 days, 5 days, 10 days, 15 days, 30 days, 45 days, 2 months, 75 days, 3 months, or 6 months. In other embodiments, administration of the same agent may be repeated and the administration may be separated by at least at least 1 day, 2 days, 3 days, 5 days, 10 days, 15 days, 30 days, 45 days, 2 months, 75 days, 3 months, or 6 months. [0245] In certain embodiments, a cyclosporin derivative of the invention and a second agent are administered to a patient, preferably a mammal, more preferably a human, in a sequence and within a time interval such that the cyclosporin derivative can act together with the other agent to provide an increased benefit than if they were administered otherwise. For example, the second active agent can be administered at the same time or sequentially in any order at different points in time; however, if not administered at the same time, they should be administered sufficiently close in time so as to provide the desired therapeutic or prophylactic effect. In one embodiment, the cyclosporin derivative and the second active agent exert their effect at times which overlap. Each second active agent can be administered separately, in any appropriate form and by any suitable route. In other embodiments, the cyclosporin derivative is administered before, concurrently or after administration of the second active agent. [0246] In various embodiments, the cyclosporin derivative and the second agent are administered less than about 1 hour apart, at about 1 hour apart, at about 1 hour to about 2 hours apart, at about 2 hours to about 3 hours apart, at about 3 hours to about 4 hours apart, at about 4 hours to about 5 hours apart, at about 5 hours to about 6 hours apart, at about 6 hours to about 7 hours apart, at about 7 hours to about 8 hours apart, at about 8 hours to about 9 hours apart, at about 9 hours to about 10 hours apart, at about 10 hours to about 11 hours apart, at about 11 hours to about 12 hours apart, no more than 24 hours apart or no more than 48 hours apart. In other embodiments, the cyclosporin derivative and the second agent are administered concurrently. [0247] In other embodiments, the cyclosporin derivative and the second agent are administered at about 2 to 4 days apart, at about 4 to 6 days apart, at about 1 week part, at about 1 to 2 weeks apart, or more than 2 weeks apart. [0248] In certain embodiments, the cyclosporin derivative and the second agent are cyclically administered to a patient. Cycling therapy involves the administration of a first agent for a period of time, followed by the administration of a second agent and/or third agent for a period of time and repeating this sequential administration. Cycling therapy can reduce the development of resistance to one or more of the therapies, avoid or reduce the side effects of one of the therapies, and/or improve the efficacy of the treatment. [0249] In certain embodiments, the cyclosporin derivative and the second active agent are administered in a cycle of less than about 3 weeks, about once every two weeks, about once every 10 days or about once every week. One cycle can comprise the administration of a cyclosporin derivative and the second agent by infusion over about 90 minutes every cycle, about 1 hour every cycle, about 45 minutes every cycle. Each cycle can comprise at least 1 week of rest, at least 2 weeks of rest, at least 3 weeks of rest. The number of cycles administered is from about 1 to about 12 cycles, more typically from about 2 to about 10 cycles, and more typically from about 2 to about 8 cycles. [0250] In other embodiments, courses of treatment are administered concurrently to a patient, i.e., individual doses of the second agent are administered separately yet within a time interval such that the cyclosporin derivative can work together with the second active agent. For example, one component can be administered once per week in combination with the other components that can be administered once every two weeks or once every three weeks. In other words, the dosing regimens are carried out concurrently even if the therapeutics are not administered simultaneously or during the same day. [0251] The second agent can act additively or synergistically with the cyclosporin derivative. In one embodiment, a cyclosporin derivative is administered concurrently with one or more second agents in the same pharmaceutical composition. In another embodiment, a cyclosporin derivative is administered concurrently with one or more second agents in separate pharmaceutical compositions. In still another embodiment, a cyclosporin derivative is administered prior to or subsequent to administration of a second agent. The invention contemplates administration of a cyclosporin derivative and a second agent by the same or different routes of administration, e.g., oral and parenteral. In certain embodiments, when a cyclosporin derivative is administered concurrently with a second agent that potentially produces adverse side effects including, but not limited to, toxicity, the second active agent can advantageously be administered at a dose that falls below the threshold that the adverse side effect is elicited. [0252] 5.5 Kits [0253] The invention also provides kits for use in methods of treatment or prophylaxis of HCV infection. The kits can include a cyclosporin derivative compound or composition of the invention, a second agent or composition, and instructions providing information to a health care provider regarding usage for treating or preventing a bacterial infection. Instructions may be provided in printed form or in the form of an electronic medium such as a floppy disc, CD, or DVD, or in the form of a website address where such instructions may be obtained. A unit dose of a cyclosporin derivative or composition of the invention, or a second agent or composition, can include a dosage such that when administered to a subject, a therapeutically or prophylactically effective plasma level of the compound or composition can be maintained in the subject for at least 1 days. In some embodiments, a compound or composition can be included as a sterile aqueous pharmaceutical composition or dry powder (e.g., lyophilized) composition. In one embodiment, the compound is according to formula (I). [0254] In some embodiments, suitable packaging is provided. As used herein, “packaging” refers to a solid matrix or material customarily used in a system and capable of holding within fixed limits a cyclosporin derivative of the invention and/or a second agent suitable for administration to a subject. Such materials include glass and plastic (e.g., polyethylene, polypropylene, and polycarbonate) bottles, vials, paper, plastic, and plastic-foil laminated envelopes and the like. If e-beam sterilization techniques are employed, the packaging should have sufficiently low density to permit sterilization of the contents. [0255] The following Examples illustrate the synthesis of representative cyclosporin derivatives used in the present invention. These examples are not intended, nor are they to be construed, as limiting the scope of the invention. It will be clear that the invention may be practiced otherwise than as particularly described herein. Numerous modifications and variations of the present invention are possible in view of the teachings herein and, therefore, are within the scope of the invention. 6. EXAMPLES 6.1 Example 1 3-Methoxy-4-(gamma-hydroxymethylleucine)-cyclosporin 3-Methoxy-4-(gamma-hydroxymethylleucine)-cyclosporin [0256] To a solution of 1,4-di-acetyl-3-methoxy-4-(gamma-hydroxymethylleucine)-cyclosporin (275 mg) in methanol (15 mL) was added 25 wt % sodium methoxide in methanol (0.12 mL) and the resulting mixture was stirred at room temperature for 24 h under nitrogen. Methanol was removed under reduced pressure and the residue was diluted with ethyl acetate (50 mL), washed with saturated ammonium chloride (30 mL), brine (30 mL), and dried over anhydrous sodium sulfate. After solvent removal, the residue was purified using preparative liquid chromatography to yield 33 mg the title compound (Compound T). [0257] NMR signals for this compound in deuterochloroform are at (ppm) 5.80 (singlet, sarcosine H), and four doublet NH signals at 7.14, 7.39, 7.69, and 7.96. LCMS (ESI): calcd for C63H113N11O14: 1247, found 1248.5 (M+H)+. 3-[(R)-2-(N,N-dimethylamino)ethylthio-Sar]-4-(gamma hydroxymethyl-leucine)cyclosporin [0258] 3-[(R)-2-(N,N-dimethylamino)ethylthio-Sar]-4-(gamma-hydroxymethyl-leucine)cyclosporin (Compound O) is prepared as described, for example, in U.S. Pat. No. 5,977,067. 6.2 Example 2 HCV Activity [0259] The instant example demonstrates that compounds of the invention are effective against HCV infection. In addition, the instant example demonstrates that compounds of the invention show advantageous efficacy, or cytotoxicity, or both when compared to cyclosporin A. [0260] The compounds of the present invention were tested for activity against HCV using the methods adapted from those described by Kriger et al., 2001, Journal of Virology, 75:4614-4624, Pietschmann et al., 2002, Journal of Virology 76:4008-4021, and using HCV RNA constructs as described in U.S. Pat. No. 6,630,343. The contents of these references are hereby incorporated by reference in their entireties. [0261] Compounds were examined in the human hepatoma cell line ET (lub ubi neo/ET), a HCV RNA replicon containing a stable luciferase (LUC) reporter. The HCV RNA replicon ET contains the 5′ end of HCV (with the HCV Internal Ribosome Entry Site (IRES) and the first few amino acids of the HCV core protein) which drives the production of a firefly luciferase (LUC), ubiquitin, and neomycin phosphotransferase (NeoR) fusion protein. Ubiquitin cleavage releases the LUC and NeoR proteins. The EMCV IRES element controls the translation of the HCV, structural proteins NS3-NS5. The NS3 protein cleaves the HCV polyprotein to release the mature NS3, NS4A, NS4B, NS5A and NS5B proteins that are required for HCV replication. At the 3′ end of the replicon is the authentic 3′ NTR of HCV. The activity of the LUC reporter is directly proportional to HCV replication levels and positive-control antiviral compounds produce a reproducible antiviral response using the LUC endpoint. [0262] The compounds were dissolved in DMSO at five half-log concentrations each, ranging from either 0.02 to 2.0 μM, 0.03 to 3 μM, 2.0 to 20 μM, or 1 to 100 μM. Subconfluent cultures of the ET line were plated out into 96 well plates dedicated for the analysis of cell numbers (cytotoxicity) or antiviral activity and the next day the compounds were added to the appropriate wells. The cells were processed 72 h later when the cells were still subconfluent. Antiviral activity was expressed as EC50 and EC90, the effective concentration of compound that reduced viral replication by 50% and 90%, respectively. Compound EC50 and EC90 values were derived from HCV RNA levels assessed as HCV RNA replicon derived LUC activity. Cytotoxicity was expressed as IC50 and IC90, the concentration of compound that inhibited cell viability by 50% and 90%, respectively. Compound IC50 and IC90 values were calculated using a colorimetric assay as an indication of cell numbers and cytotoxicity. The activity of the LUC reporter is directly proportional to HCV RNA levels in the human cell line. The HCV-replicon assay was validated in parallel experiments using interferon-alpha-2b as a positive control. Cyclosporine was also tested by way of comparison. Compounds of the invention potently inhibit HCV replication in human liver cells to a greater extent than cyclosporin. In addition, when considering the level of cytotoxicity, many of the compounds of this invention exhibit a wider safety margin (for example, cytotoxicity IC50 versus antiviral EC50) than cyclosporine. [0263] The results were as follows (unless otherwise stated all values are expressed in nM), “N/D” means that the data was not determined. HCV Activity Cytotoxicity Compound EC50 EC90 IC50 IC90 O 122 300 13440 >20000 T 80 410 >2000 >2000 Cyclosporine 400 1420 5780 19403 6.3 Example 3 Cyclophilin Binding and HCV Activity [0264] The instant example provides further methods for evaluating the effectiveness of compounds of the invention for treating or preventing HCV infection in a subject in need thereof. [0265] It has been demonstrated that certain cyclosporins are effective in treating or preventing HCV infection through the binding of the cyclosporin to cyclophilin B (CyPB). See Watashi et al., 2005, Molecular Cell 19:111-122; Nakagawa et al., 2005 Gastroenterology 129(3):1031-41; the contents of which are hereby incorporated by reference in their entirety. Although not intending to be bound by any particular theory of operation, it is believed that cyclophilin B is critical for the efficient replication of the HCV genome. Cyclosporin A and derivatives of cyclosporin that inhibit cyclophilin B can dramatically reduce the replication of HCV in standard assays. [0266] Accordingly, compounds of the present invention are shown to be effective for the treatment or prevention of HCV infection by evaluating their binding or modulation of cyclophilin, for instance cyclophilin B. Modulation of cyclophilin by a compound of this invention is measured according to standard techniques, for example, those described in Watashi et al., 2005, those described in Nakagawa et al., 2005, or those described in Billich et al., J. Virol. 69:2451-2461, the contents of which are hereby incorporated by reference in their entireties. 6.4 Example 4 Oral Dosage Forms [0267] One or more of the compounds of the invention can be formulated as a capsule. Such a capsule can comprise 10 to 200 mg of the compound and on or more excipients selected from the group consisting of microcrystalline cellulose, pregelatinized starch, lactose, sodium starch glycolate, crospovidone, povidone, hydroxypropylcellulose, magnesium stearate and silicon dioxide. The resulting composition can be encapsulated with one or more standard encapsulation compositions such as gelatin or a plasticizer. [0268] One or more of the compounds of the invention can be formulated as a salt in a syrup or elixir. The compound or compounds can be at a total concentration of 5 to 50 mg/mL. The syrup or elixir can further comprise polyethylene glycol, propylene glycol, mixtures of polyethylene glycol, PEG 400, a block copolymer of ethylene oxide and propylene oxide (e.g., poloxamer 407), polysorbate 20, ethanol, a sugar, citric acid and/or flavoring. 6.5 Example 5 Additive and Synergistic anti-HCV Activity of Compounds of the Invention in Combination with Interferon [0269] Compounds and combinations were evaluated in the HCV replicon assay described in Example 2 with changes indicated below. [0270] For single-compound assays, the compounds were dissolved in DMSO at five half-log concentrations each, ranging from either 0.02 to 2 μM or 0.2 to 20 μM. Compound EC50 and EC90 values, as well as IC50 and IC90 values, were determined according to Example 2. The HCV-replicon assay was validated in parallel experiments using interferon-alpha-2b as a positive control. Cyclosporine A was also tested. [0271] The HCV RNA replicon antiviral evaluation assay was utilized to examine the efficacy and cytotoxicity of two compounds (e.g., Drug 1 and Drug 2) in combinations of five versus nine half-log concentrations. The assay was performed using a microtiter plate format for allocation of media, drug, cells, and virus. Sub-confluent cultures of the ET line were transferred into 96-well plates for the analysis of cell numbers (cytotoxicity) or antiviral activity; approximately 24 h later Drugs 1 and 2 were added to the appropriate wells. Cells were processed 72 hr later when the cells were still sub-confluent. The HCV RNA replicon levels were assessed as HCV RNA replicon-derived Luc activity as described in Example 2. The cytotoxicity was evaluated as the concentration of the drug that reduced cell numbers as described in Example 2. [0272] Compounds of this invention were tested as “Drug 2” at nine concentrations between 0.0078 to 2.0 μM. Interferon-alpha (Sigma) was tested as Drug 1 at 0.005 to 0.5 international units per mL (IU/mL). The data obtained from these checkerboard assays were analyzed with the MacSynergy II (v2.01) (Prichard & Shipman, 1990, Antiviral Res. 14:181-205) and Delta Graph (v1.5d) programs. Each data point used to create three-dimensional plots (FIGS. 1A-1C) was derived from the result of triplicate samples. The statistical relevance of the data was analyzed and plotted at one of three confidence levels (68%, 95% or 99%) to display combinatorial results as additive, synergistic or antagonistic. [0273] Effects of the drug combinations were calculated based on the activity of each compound when tested alone. The expected additive antiviral protection was subtracted from the experimentally determined antiviral activity at each combination concentration resulting in a positive value (synergy), a negative value (antagonism) or zero (additive). The results presented three dimensionally at each combination concentration yield a surface of activity extending above (synergy) or below (antagonism) the “plane of additivity.” Synergy is defined as drug combinations yielding synergy volumes greater than 50. Slightly synergistic activity and highly synergistic activity have been operationally defined as yielding synergy volumes of 50-100 and >100, respectively. Additive drug interactions have synergy volumes in the range of −50 to 50. Antagonistic drug interactions have synergy volumes in the range or —50 and —100, and those <−100 are highly antagonistic. [0274] For Compound O, Compound T, and cyclosporin A, the volume of the surface was calculated and expressed as a synergy volume (in units of concentration times concentration times percent; e.g. μM2%, nM2%, nMμM %, and for IFN (IU/ml)μM %, etc.) at the 95% confidence interval (FIGS. 1A-1C). [0275] As shown in FIG. 1A, the combination of Compound O and IFNα is highly synergistic. The EC50 of Compound O alone was 100 nM, and the IC50 of Compound O alone was >2000 nM. At a 95% confidence interval, the antiviral synergy volume was 122 IU/mLμM %, or highly synergistic. [0276] As shown in FIG. 1B, the combination of Compound T and IFNα is additive. The EC50 of Compound T alone was 200 nM, and the IC50 of Compound T alone was >2000 nM. At a 95% confidence interval, the antiviral synergy volume was 6 IU/mLμM %, or additive. [0277] As shown in FIG. 1C, the combination of Cyclosporin A and IFNα is additive. The EC50 of Cyclosporin A alone was 750 nM, and the IC50 of Cyclosporin A alone was >2000 nM. At a 95% confidence interval, the antiviral synergy volume was 43 IU/mLμM %, or additive. 6.6 Example 6 Activity against HCV of Compounds of the Invention in Combination with a Reverse Transcriptase Inhibitor [0278] Compounds and combinations were evaluated in the HCV replicon assay described in Example 5 with changes noted below. [0279] Compound O of this invention were tested as “Drug 2” at nine concentrations between 0.0078 to 2.0 μM. 2′-C-methyl-cytidine (the active form of the prodrug valopicitabine, and a potent NS5B inhibitor) was added as Drug 1; Drug 1 was tested at 62.5, 125, 250, and 500 nM. [0280] For Compound O, the volume of the surface was calculated and expressed as a synergy volume (in units of concentration times concentration times percent; e.g. μM2%.) at the 95% confidence interval (FIG. 2). [0281] As shown in FIG. 2, the combination of Compound O and 2′-C-methyl-cytidine is highly synergistic. In this experiment, the EC50 values of Compound O and 2′-C-methyl-cytidine alone were 250 nM and 750 nM, respectively. The IC50 of Compound O alone was >2000 nM. At a 95% confidence interval, the antiviral synergy volume was 228 μM2%, or highly synergistic. 6.7 Example 7 Activity Against HCV and Toxicity of Compounds of the Invention in Combination with a Protease Inhibitor [0282] Compounds and combinations were evaluated in the HCV replicon assay described in Example 5 with changes noted below. (1R, 2S, 5S)-3-Azabicyclo[3,1,0]hexane-2-carboxamide,N-[3-amino-1-cyclobutylmethyl)-2,3-dioxopropyl]-3-[(2S)-2-[[[1,1-dimethylethyl]amino]carbonylamino]-3,3-dimethyl-1-oxobutyl]-6,6-dimethyl, a protease inhibitor (a HCV NS3-4A protease inhibitor), hereinafter referred to as Compound 3, was prepared according the methods described in US patent application publication No. 2005/0249702 and PCT publication No. WO2004/113294, the contents of which are incorporated by reference herein and relied upon (the compound was tested as a 1:1 diastereomeric mixture at the chiral center bonded to cyclobutylmethyl moiety: i.e., carbon-atom 1 of the 3-amino-1-cyclobutylmethyl)-2,3-dioxopropyl residue.) [0283] Effects of the drug combinations were calculated based on the activity of each compound when tested alone. The expected additive antiviral protection was subtracted from the experimentally determined antiviral activity at each combination concentration resulting in a positive value (synergy), a negative value (antagonism), or zero (additivity). The results of the combination assays are presented three dimensionally at each combination concentration, yielding a surface of activity extending above (synergy) or below (antagonism) the plane of additivity. The volume of the surface is calculated and expressed as a synergy volume (in units of concentration times concentration times percent; e.g. μM2%, nM2%, nMμM %, etc.) calculated at the 95% confidence interval. For these studies, synergy is defined as drug combinations yielding synergy volumes greater than 50. Additive drug interactions have synergy volumes in the range of −50 to 50, while synergy volumes between −50 and —100 are considered slightly antagonistic and those <−100 are highly antagonistic. [0284] As shown in FIG. 3A the combination of Compound O and Compound 3 was additive or mildly synergistic. [0285] As shown in FIG. 3B, the combination of Compound O and Compound 3 showed antagonistic cytotoxicity, i.e. a reduced toxicity. 6.8 Example 8 Activity of Cyclosporin Derivatives Against Bovine Viral Diarrhea Virus in Combination Studies with Interferon and Ribavirin [0286] Compounds were evaluated alone and in combination with ribavirin or alpha interferon (IFN-α) in Madin-Darby bovine kidney cells against the NADL (National Animal Disease Laboratory) strain of the HCV surrogate, Bovine Viral Diarrhea Virus (BVDV). BVDV, also a member of the Flaviviridae family of viruses, shares many important features with HCV and is recognized as a valid surrogate for the evaluation of antiviral compounds for use against HCV (Buckwald V E, Wei J, Wenzel-Mathers M, Russell J. “Synergistic in vitro interactions between alpha interferon and ribavirin against bovine viral diarrhea virus and yellow fever virus as surrogate models of hepatitis C virus replication” Antimicrob Agents Chemother. 2003, 47: 2293). BVDV and HCV have similar genomic RNA structures, and both utilize an internal ribosome entry site (IRES) for translation initiation. Using the well established host-cell line known as Madin-Darby bovine kidney (MDBK) cells, compounds were tested against BVDV, alone and in combination with interferon and ribavirin. [0287] The methodology used herein for testing compounds as single agents or in drug combinations against BVDV's cytopathic effect in MDBK cells has been previously described: Buckwald V E, et al. Antimicrob Agents Chemother. 2003, 47: 2293). A summary of the methods is provided. The compounds of this invention were dissolved in DMSO to prepared stock solutions for dilution into the assay. Compounds were serially diluted, starting at a high concentration of 10 or 20 μM, in half-logarithmic increments for evaluation in the in vitro antiviral assay. As single agents, Ribavirin (Sigma, St. Louis, Mo.) and alpha interferon-alpha (IFN-α, Sigma) were evaluated at 100 μM and 10 U/ml high test concentration, respectively, and serially diluted in half-logarithmic increments for evaluation in the in vitro antiviral assay. MDBK cells were suspended at 5×104 cells per ml in tissue culture medium and added to flat bottom microtiter plates in a volume of 100 μL. Total cells and cell viability quantification was performed using a hemacytometer and Trypan Blue dye exclusion. The plates were incubated at 37° C./5% CO2 overnight to allow for cell adherence. [0288] BVDV was obtained from the American Type Culture Collection (ATCC) and was grown in MDBK cells for the production of stock virus pools. Virus was suspended and diluted into tissue culture medium such that the amount of virus added to each well in a volume of 100 μL was the amount determined to yield 85 to 95% cell killing at 6 days post-infection. [0289] Each microtiter plate contained cell control wells (cells only), virus control wells (cells plus virus), drug toxicity wells (cells plus compound only), drug colorimetric control wells (drug only), and the experimental wells (compound plus cells plus virus). Samples were tested in triplicate for efficacy and in duplicate for cytotoxicity. Following incubation at 37° C. in a 5% CO2 incubator, the test plates were stained with the tetrazolium dye XTT (2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenylamino)carbonyl]-2H-tetrazolium hydroxide). XTT-tetrazolium was metabolized by the mitochondrial enzymes of metabolically active cells to a soluble formazan product, allowing rapid quantitative analysis of the inhibition of BVDV induced cell killing by anti-BVDV test substances. XTT solution was prepared daily as a stock of 1 mg/mL in medium (RPMI1640). Phenazine methosulfate (PMS) solution was prepared at 0.15 mg/mL in PBS and stored in the dark at −20° C. XTT/PMS stock was prepared immediately before use by adding 40 μL of PMS per ml of XTT solution. Fifty microliters of XTT/PMS was added to each well of the plate and the plate was reincubated for 4 hours at 37° C. Plates were sealed with adhesive plate sealers and shaken gently or inverted several times to mix the soluble formazan product and the plate was read spectrophotometrically at 450/650 nm with a Molecular Devices Vmax plate reader. [0290] Data Analysis—Raw data was collected from the Softmax Pro 4.6 software and imported into a Microsoft Excel 2003 spreadsheet for analysis by linear curve fit calculations. Antiviral activity was expressed as EC50 and EC90, the effective concentration of compound that reduced viral replication by 50% and 90%, respectively; cytotoxicity was expressed as IC50 and IC90, the concentration of compound that inhibited cell viability by 50% and 90%, respectively. Data was summarized in tables of mean optical density values at each compound concentration in the efficacy, toxicity and colorimetric wells along with calculated percentage of reduction values for viral cytopathic effect (CPE) and cell viability; data was used for graphical presentation of the percentage of cell viability and percentage of reduced viral CPE at each test concentration. [0000] Drug-Drug Combination Experiments [0291] The BVDV antiviral evaluation assay was utilized to examine the efficacy and cytotoxicity of two compounds (e.g., Drug 1 and Drug 2) in combinations of five versus nine half-log concentrations. The assay was performed using a microtiter plate format for allocation of media, drug, cells, and virus. Statistical evaluations were performed according to the method of Prichard and Shipman (Antiviral Research 1990, 14:181-206). Five concentrations of each test compound (Drug 1) were tested in all possible combinations with nine concentrations of either ribavirin or IFN-α (Drug 2). Endpoint quantification was performed by XTT-tetrazolium staining to quantify cell viability. Effects of the drug combination were calculated based on the activity of the two compounds when tested alone. The expected additive antiviral protection was subtracted from the experimentally determined antiviral activity at each combination concentration resulting in a positive value (synergy), a negative value (antagonism), or zero (additivity). The results of the combination assays were expressed as a synergy volume (μM2%) calculated at the 95% confidence interval. [0292] For the BVDV studies, synergy was defined as drug combinations yielding synergy volumes greater than 50 μM2%. Slightly synergistic activity and highly synergistic activity have been defined as yielding synergy volumes of 50-100 μM2% and >100 μM2%, respectively. Synergy volumes between −50 and 50 μM2% were considered additive and synergy volumes less than −50 μM2% were considered antagonistic. [0000] Results from drug combinations in BVDV Assay with Ribavirin: [0293] Compounds of the invention and ribavirin were synergistic with respect to antiviral activity against BVDV, the surrogate virus for human HCV. There was no significant antagonistic activity observed when compounds of the invention were tested in combination with ribavirin. Compounds C and O were more synergistic than cyclosporin A, having synergy volumes of 25% greater than that of Cyclosporin A. [0000] Results from drug combinations in BVDV Assay with IFN-α. [0294] Additive interactions of anti-BVDV were demonstrated with compound C or CsA in combination with IFN-α. Compound O exhibited a synergistic interaction with IFN-α. Antagonistic cytotoxicity resulted from the combination of compound O plus IFN-α, or compound C plus IFN-α, thus indicating a reduction in toxicity to the target cells with these compounds when used in combination compared to the toxicity of each compound alone. Synergistic toxicity, i.e. an increase in toxicity in combination compared to each compound alone at those concentrations, was observed with CsA plus IFN-α. [0295] All publications and patent, applications cited in this specification are herein incorporated by reference as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. While the invention has been described in terms of various preferred embodiments, the skilled artisan will appreciate that various modifications, substitutions, omissions, and changes may be made without departing from the spirit thereof. Accordingly, it is intended that the scope of the present invention be limited solely by the scope of the following claims, including equivalents thereof. 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