WS7622A di- sulfate, process for preparation thereof and use thereof

Abstract: Mono- or di-sulfate of the compound WS7622A, which is obtainable by culturing Streptomyces resistomycificus No. 7622 (FERM BP-2306), processes for preparation such sulfates and pharmaceutical compositions comprising them or their pharmaceutically acceptable salts as an active ingredient.

Description: The inventors of this invention prepared previously WS7622A substance which is used as a starting material in this invention, by culturing a strain of Streptomyces resistomycificus No. 7622 in a nutrient medium and filed a patent application covering the substance in various countries (cf. European Patent Application No.A-0 387 712). Streptomyces resistomycificus No. 7622 was deposited with International Depositary Authority under the Budapest Treaty, the Fermentation Research Institute, Agency of Industrial Science and Technology (1-3, Higashi 1-chome, Tsukuba-shi, Ibaraki-ken, 305 Japan) under the accession number of FERM BP-2306 (the deposited date : February 23, 1989). The WS7622A substance, however, is insoluble in water and so the inventors of this invention studied on improvement of solubility of WS7622A substance in water so that they succeeded in improving solubility of WS7622A substance in water by sulfating WS7622A substance. The present invention provides WS7622A di- sulfate and their pharmaceutically acceptable salt, among which di-sodium salt of WS7622A di-sulfate and di-potassium salt of WS7622A di-sulfate have the physico-chemical properties as defined in claim 1. A preferred embodiment of the present invention is di-alkali metal salt of WS7622A di-sulfate. A further preferred embodiment of the present invention is di-sodium salt of WS7622A di-sulfate. The process for preparation of WS7622A di-sulfate or their salt comprises sulfating WS7622A or its salt in the presence or absence of a base to give WS7622A di-sulfate or their salt. Preferably the above process comprises sulfating WS7622A or its salt in the presence of a base to give di-alkali metal salt of WS7622A di-sulfate, wherein it is still further preferred, that the di-alkali metal salt of WS7622A di-sulfate is di-sodium salt. The present invention further provides a pharmaceutical composition comprising as an effective ingredient WS7622A di- sulfate as defined above or their pharmaceutically acceptable salt in association with a pharmaceutically acceptable carrier or excipient, which may be for or for use in treatment or prevention of degenerative diseases such as pulmonary emphysema, atherosclerosis, rheumatoid arthritis, osteoarthritis, psoriasis, pancreatitis, and adult-respiratory distress syndrome, cystic fibrosis, chronic bronchitis, bronchiectasia, or treatment or prevention of graft rejection, or for treatment or prevention of nephritis, sepsis or asthma. The present invention further provides a human leukocyte elastase inhibitor comprising as an effective ingredient WS7622A di- sulfate as defined above or their pharmaceutically acceptable salt in association with a pharmaceutically acceptable carrier or excipient. Still further the present invention provides a use of WS7622A di-sulfate as defined above and their pharmaceutically acceptable salts for the manufacture of a medicament for therapeutic treatment or prevention of degenerative diseases such as pulmonary emphysema, atherosclerosis, rheumatoid arthritis, osteoarthritis, psoriasis, pancreatitis and adult respiratory distress syndrome, cystic fibrosis, chronic bronchitis, bronchiectasia, and nephritis, sepsis, asthma or graft rejection. The starting material, WS7622A substance possesses the following physico-chemical properties: Appearance : colorless prism Nature of substance : acidic Color reaction : positive; cerium sulfate, iodine vapor negative; ninhydrin, Molish Solubility : soluble; methanol, ethanol, n-butanol sparingly soluble; chloroform, acetone, ethyl acetate insoluble; water, n-hexane Thin Layer Chromatography (TLC) : ¹H Nuclear magnetic resonance spectrum : ¹³C Nuclear magnetic resonance spectrum : Amino acid analysis : WS7622A (1 mg) was hydrolyzed with 6N HCl (1 ml) at 110°C for 20 hours and the mixture was evaporated to dryness. The obtained mixture was analyzed on Hitachi 835 automatic amino acid analyzer. Amino acid standard solution [Type H (Wako Chemicals 013-08391) and Type B (Wako Chemicals 016-08641) were used.] were used as reference. As the result, threonine, valine, phenylalanine, ornithine, NH₃ and unknown ninhydrin-positive components were detected. A salt of the WS7622A may include a salt with an inorganic or organic base such as an alkali metal salt (e.g. sodium salt, potassium salt), an alkaline earth metal salt (e.g. calcium salt), ammonium salt, ethanolamine salt, triethylamine salt, dicyclohexylamine salt or the like. Suitable sulfating agents to be used for the preparation of the WS7622A di- sulfate and their pharmaceutically acceptable salt of this invention are chlorosulfonic acid, sulfamic acid, a combination of dicyclohexylcarbodiimide and sulfuric acid, a combination of dicyclohexylcarbodiimide and tetrabutylammonium hydrogen sulfate, sulfur trioxide adducts such as sulfur trioxide pyridine complex, sulfur trioxide trimethylamine complex, sulfur trioxide triethylamine complex, sulfur trioxide dioxane complex, sulfur trioxide dimethylaniline complex or the like. The reaction is usually carried out in a conventional solvent, such as methylene chloride, chloroform, benzene, toluene, pyridine, diethyl ether, dioxane, tetrahydrofuran, acetone, acetonitrile, ethyl acetate, N,N-dimethylformamide or any other organic solvent which does not adversely affect the reaction. The reaction temperature is not critical and the reaction can be carried out under cooling, at ambient temperature, or under heating. This reaction may be preferably conducted in the presence of a base. Suitable base may be an inorganic base such as alkali or alkaline earth metal hydroxide (e.g. sodium hydroxide, potassium hydroxide, calcium hydroxide), alkali metal bicarbonate (e.g. sodium bicarbonate, potassium bicarbonate), alkali or alkaline earth metal carbonate (e.g. sodium carbonate, potassium carbonate, calcium carbonate), alkali metal phosphate (e.g. sodium dihydrogenphosphate, potassium dihydrogenphosphate, disodium hydrogenphosphate, dipotassium hydrogenphosphate) or an organic base such as alkali metal alkoxide (e.g. sodium methoxide, potassium ethoxide), amine (e.g. triethylamine, pyridine, lutidine). A pharmaceutically acceptable salt of the WS7622A di- sulfate may include mono- or di- salt with an inorganic or organic base such as an alkali metal salt (e.g. sodium salt, potassium salt), an alkaline earth metal salt (e.g. calcium salt), ammonium salt, ethanolamine salt, triethylamine salt, dicyclohexylamine salt, pyridine salt or the like. In order to illustrate the usefulness of the WS7622A di- sulfate and their pharmaceutically acceptable salt, pharmacological test data thereof are shown below. 1. Protease Inhibition assay (1) Method : A buffer used throughout the assay was 0.1M HEPES (N-(2-hydroxyethyl)piperazine-N'-(2-ethanesulfonic acid) containing 0.5M NaCl, pH 7.5. Twenty-five microliters of 2 mM methoxysuccinyl-(Ala)₂-Pro-Val-p-nitroanilide (100 mM of dimethyl sulfoxide solution were diluted in the buffer) and 50 µl of sample (10 µl of sample in organic solvent was diluted 5-fold in the buffer) were mixed in wells of 96 well-microliter plate. An absorbance of the mixture in wavelength at 415 nm was measured by a microplate reader (Corona Electric Co., Ibaraki, Japan). After the measurement, 25 µl of 6 µg/ml human sputum elastase (HSE) were added and stand for 30 min at room temperature. Then, the absorbance at 415 nm was measured. Percent inhibition by drug was determined by 100 x (1-"r" inhibitor present/"r" inhibitor absent), where "r" is absorbance after 30 min incubation minus absorbance before enzyme addition. Effects of inhibitors against other proteases were assayed similarly using N-succinyl-(Ala)₃-p-nitroanilide for porcine pancrease elastase (Type IV, 5 µg/ml final), N-alpha-benzoyl-Arg-p-nitroanilide for bovine pancreas trypsin (Type I, 16 µg/ml final), methoxysuccinyl-(Ala)₂-Pro-Met-p-nitroanilide for bovine pancreas chymotrypsin (Type II, 1.5 µg/ml final). HSE were obtained from Elastin Products Company Inc., MO, U.S.A. All other substrates and proteases were purchased from Sigma Chemicals Co. (2) Result : Inhibitory effect of di-sodium salt of WS7622A di-sulfate and di-potassium salt of WS7622A di-sulfate on several serine protease activity IC₅₀ (M) substance (M) Human sputum elastase Porcine pancreas elastase Trypsin (bovine) Chymotrypsin (bovine) di-sodium salt of WS7622A di-sulfate 3.5x10⁻⁸ 4.9x10⁻⁸ 1.8x10⁻⁴ 2.0x10⁻⁷ di-potassium salt of WS7622A di-sulfate 5.9x10⁻⁸ 4.9x10⁻⁸ 2.9x10⁻⁴ 2.0x10⁻⁷ Each value was expressed as 50% inhibitory concentration (IC₅₀). 2. Determination of the activity in elastase-induced pulmonary damage. (1) Method : Hamsters under pentobarbital anesthesia were used. Saline or saline-containing human sputum elastase was instilled intratracheally via a small incision in the ventral neck region using 1-ml syringe with a 27-gauge needle. After 3 hours, animals were sacrificed by CO₂ asphyxiation, each animal's trachea was reexposed. The lungs were then lavaged using a 2.5-ml aliquot of saline and then withdrawing the saline, yielding a final volume of approximately 1.5 ml bronchoalveolar lavage (BAL) fluid from each animal. The cells of BAL fluid were collected by centrifugation and were then diluted with distilled water to disrupt, and the hemoglobin contents determined spectrophotometrically at 541 nm. Test drugs were dissolved in saline and instilled intratracheally in the same manner as used to instill elastase, at 5 minutes before instillation of elastase. (2) Result : Inhibitory effect on elastase-induced lung hemorrhage Test compound 5 min predose (µg/site) Hemorrhage (OD 541 nm) % inhibition Normal - 0.31±0.12 - control - 29.35±2.9 - di-sodium salt of WS7622A di-sulfate 1 19.06±1.40 35.4 10 9.75±4.82 67.5 100 0.28±0.05 100.1 di-potassium salt of WS7622A di-sulfate 1 19.71±1.20 33.2 10 10.73±1.20 64.1 100 0.35±0.16 99.9 Pharmaceutical compositions of this invention can be used in a conventional pharmaceutical forms such as injections, inhalation powders, fine granules, granules, tablets, dragee, microcapsules, capsules, suppository, solution, suspension, emulsion syrups and the like. If desired, diluents or disintegrators (e.g. sucrose, lactose, starch, crystalline cellulose, low-substituted hydroxypropyl cellulose, synthetic aluminum silicate, etc.), binding agents (e.g. cellulose, methylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, polypropylpyrrolidone, polyvinylpyrrolidone, gelatin, gum arabic, polyethyleneglycol, etc.), coloring agents, sweeting agents, lubricant (e.g. magnesium stearate, etc.) or the like, may be dispensed with said composition. The dosage of said composition of this invention depends on the patient's age, body weight, condition, etc., and it is generally administered by the oral route at the daily dose level of 100 mg to 10 g as the object compound or its pharmaceutically acceptable salt, preferably 1 g to 5 g on the same basis, at the interval of 1 to 3 times a day. Typical unit doses may be 50 mg, 100 mg, 200 mg, 500 mg, 1 g and the like, although these are only examples and not limitative, of course. The following Examples are given for the purpose of illustrating this invention. Example 1 In a 300 ml three-necked flask were placed sulfur trioxide trimethylamine complex (13.9 g, Aldrich), anhydrous potassium carbonate (6.9 g) and WS7622A substance (10 g), and anhydrous dimethylformamide (50 ml) was added thereto and the mixture was vigorously stirred at room temperature overnight. The mixture was evaporated to dryness under reduced pressure and the residue was dissolved in ice-water (300 ml) and charged on a column of HP20ss (9.6 x 25 cm). The column was washed with water (10 ℓ) and eluted with MeOH-H₂O (4:6) (2 ℓ). The product fractions were collected and evaporated to dryness to give a powder. The powder was dissolved in H₂O (70 ml) and passed through a column of AG50W-X4 (Na⁺ form, 4 x 32 cm, Bio-Rad laboratories) and evaporated to dryness. The obtained powder (11.2 g) was recrystallized from hot ethanol (50 ml) to give 10.6 g of di-sodium salt of WS7622A di-sulfate as colorless crystals. Example 2 In a 300 ml three-necked flask were placed sulfur trioxide trimethylamine complex (13.9 g, Aldrich), anhydrous potassium carbonate (6.9 g) and WS7622A substance (10 g), and anhydrous dimethylformamide (50 ml) was added thereto and the mixture was vigorously stirred at room temperature overnight. The mixture was evaporated to dryness under reduced pressure and the residue was dissolved in ice-water (300 ml) and charged on a column of HP20ss (9.6 x 25 cm). The column was washed with water (10 ℓ) and eluted with MeOH-H₂O (4:6) (2 ℓ). The product fractions were collected and evaporated to dryness to give 11.8 g of di-potassium salt of WS7622A di-sulfate as a colorless powder.

Claims: Claims for the following Contracting States : AT, BE, CH, DE, DK, FR, GB, IT, LI, LU, NL, SE WS7622A di- sulfate and their pharmaceutically acceptable salt, among which di-sodium salt of WS7622A di-sulfate and di-potassium salt of WS7622A di-sulfate have the following physico-chemical properties : Di-sodium salt of WS7622A di-sulfate : Appearance : colorless crystals Solubility : soluble; water, methanol insoluble; chloroform, n-hexane Melting point : 257-263°C (dec.) Specific rotation : [α] 23 / D + 37.5° (C=1.0, methanol) Molecular formula : C₄₇H₆₁N₉O₁₉S₂Na₂ Elemental analysis : calcd. (C₄₇H₆₁N₉O₁₉S₂Na₂·6H₂O); C 44.30, H 5.77, N 9.89, S 5.03, Na 3.61 % found : C 44.98, H 5.90, N 10.06, S 5.00, Na 3.98 % Molecular weight : FAB-MS m/z 1188 (M+Na)⁺ Thin layer chromatography : Stationary phase Developing solvent Rf value silica gel (Merck Art 5715) CHCl₃-CH₃OH-H₂O (65 : 25 : 4) 0.11 n-butanol-acetic acid-water ( 4 : 2 : 1) 0.29 Infrared absorption spectrum (attached Fig. 1) : ν KBr / max 3360, 2960, 1735, 1660, 1640, 1530, 1500, 1380, 1250, 1200, 1060, 1030, 940, 890 cm⁻¹ ¹H Nuclear magnetic resonance spectrum (attached Fig. 2): (400MHz, D₂O) δ 7.50 (1H, s) 7.27 (1H, s) 7.33-7.24 (3H, m) 6.94 (1H, q, J=7Hz) 6.85 (2H, br d, J=8Hz) 5.53 (1H, m) 5.37 (1H, m) 4.80 (1H, br s) 4.63-4.57 (2H, m) 4.53 (1H, m) 4.06 (1H, m) 3.99 (1H, d, J=10Hz) 3.56 (1H, br d, J=14Hz) 3.46 (1H, m) 2.97 (3H, s) 2.97-2.88 (2H, m) 2.72 (1H, m) 2.59 (1H, m) 2.51-2.38 (2H, m) 2.09-1.91 (4H, m) 1.82-1.60 (3H, m) 1.77 (3H, d, J=7Hz) 1.50 (3H, d, J=6.5Hz) 1.40 (1H, m) 1.11 (6H, d, J=7Hz) 0.99 (3H, d, J=6.5Hz) 0.97 (3H, d, J=6.5Hz) ¹³C Nuclear magnetic resonance spectrum (attached Fig.3): Amino acid analysis : Di-sodium salt of WS7622A di-sulfate (1 mg) was hydrolyzed with 6N HCl (1 ml) at 110°C for 20 hours and the mixture was evaporated to dryness. The obtained mixture was analyzed on Hitachi 835 automatic amino acid analyzer. Amino acid standard solution [Type H (Wako Chemicals 013-08391) and Type B (Wako Chemicals 016-08641) were used.] were used as reference. As the result, threonine, valine, phenylalanine, ornithine, NH₃ and unknown ninhydrin-positive components were detected. Di-potassium salt of WS7622A di-sulfate : Appearance : colorless amorphous powder Solubility : soluble; water, methanol insoluble; chloroform, n-hexane Melting point : 230-237°C (dec.) Specific rotation : [α] 23 / D + 34° (C=1.0, methanol) Molecular formula : C₄₇H₆₁N₉O₁₉S₂K₂ Elemental analysis : calcd. (C₄₇H₆₁N₉O₁₉S₂K₂·6H₂O) ; C 43.21, H 5.63, N 9.65, S 4.91, K 5.99 % found : C 43.96, H 5.44, N 9.97, S 5.09, K 4.49 % Molecular weight : FAB-MS m/z 1236 (M+K)⁺ Thin layer chromatography : Stationary phase Developing solvent Rf value silica gel (Merck Art 5715) CHCl₃-CH₃OH-H₂O (65 : 25 : 4) 0.13 Infrared absorption spectrum (attached Fig. 4) : ν KBr / max 3360, 2960, 1735, 1660, 1640, 1530, 1500, 1405, 1380, 1250, 1200, 1050, 1030, 940, 890 cm⁻¹ ¹H Nuclear magnetic resonance spectrum (attached Fig. 5) : Amino acid analysis : Di-potassium salt of WS7622A di-sulfate (1 mg) was hydrolyzed with 6N HCl (1 ml) at 110°C for 20 hours and the mixture was evaporated to dryness. The obtained mixture was analyzed on Hitachi 835 automatic amino acid analyzer. Amino acid standard solution [Type H (Wako Chemicals 013-08391) and Type B (Wako Chemicals 016-08641) were used.] were used as reference. As the result, threonine, valine, phenylalanine, ornithine, NH₃ and unknown ninhydrin-positive components were detected. A compound according to claim 1, wherein the compound is di-alkali metal salt of WS7622A di-sulfate. A compound according to claim 2, wherein the compound is di-sodium salt of WS7622A di-sulfate. A process for preparation of WS7622A di-sulfate or their salt which comprises sulfating WS7622A or its salt in the presence or absence of a base to give WS7622A di-sulfate or their salt, among which di-sodium salt of WS7622A di-sulfate and di-potassium salt of WS7622A di-sulfate have the physico-chemical properties as defined in claim 1. A process according to claim 4, which comprises sulfating WS7622A or its salt in the presence of a base to give di-alkali metal salt of WS7622A di-sulfate. A process according to claim 5, wherein the di-alkali metal salt of WS7622A di-sulfate is di-sodium salt. A pharmaceutical composition comprising as an effective ingredient WS7622A di- sulfate as defined in claim 1 or their pharmaceutically acceptable salt in association with a pharmaceutically acceptable carrier or excipient. A human leukocyte elastase inhibitor comprising as an effective ingredient WS7622A di- sulfate as defined in claim 1 or their pharmaceutically acceptable salt in association with a pharmaceutically acceptable carrier or excipient. A pharmaceutical composition for treatment or prevention of degenerative diseases such as pulmonary emphysema, atherosclerosis, rheumatoid arthritis, osteoarthritis, psoriasis, pancreatitis, and adult respiratory distress syndrome, cystic fibrosis, chronic bronchitis, bronchiectasia comprising as an effective ingredient WS7622A di- sulfate as defined in claim 1 or their pharmaceutically acceptable salt in association with a pharmaceutically acceptable carrier or excipient. A pharmaceutical composition for treatment or prevention of graft rejection comprising as an effective ingredient WS7622A di- sulfate as defined in claim 1 or their pharmaceutically acceptable salt in association with a pharmaceutically acceptable carrier or excipient. A pharmaceutical composition for treatment or prevention of nephritis, sepsis or asthma comprising as an effective ingredient WS7622A di-sulfate as defined in claim 1 or their pharmaceutically acceptable salt in association with a pharmaceutically acceptable carrier or excipient. WS7622A di-sulfate as defined in claim 1 or their pharmaceutically acceptable salt for use in treating or preventing degenerative diseases such as pulmonary emphysema, atherosclerosis, rheumatoid arthritis, osteoarthritis, psoriasis, pancreatitis, and adult respiratory distress syndrome, cystic fibrosis, chronic bronchitis, bronchiectasia in a subject in need thereof. WS7622A di-sulfate as defined in claim 1 or their pharmaceutically acceptable salt for use in treating or preventing graft rejection in a subject in need thereof. WS7622A di-sulfate as defined in claim 1 or their pharmaceutically acceptable salt for use in treating or preventing nephritis, sepsis or asthma in a subject in need thereof. Use of a compound of any of claims 1 to 6 and their pharmaceutically acceptable salts for the manufacture of a medicament for therapeutic treatment or prevention of degenerative diseases such as pulmonary emphysema, atherosclerosis, rheumatoid arthritis, osteoarthritis, psoriasis, pancreatitis and adult respiratory distress syndrome, cystic fibrosis, chronic bronchitis, bronchiectasia, and nephritis, sepsis, asthma or graft rejection. Claims for the following Contracting States : ES, GR A process for preparation of WS7622A di-sulfate or their salt which comprises sulfating WS7622A or its salt in the presence or absence of a base to give WS7622A di-sulfate or their salt, among which di-sodium salt of WS7622A di-sulfate and di-potassium salt of WS7622A di-sulfate have the following physico-chemical properties : Di-sodium salt of WS7622A di-sulfate : Appearance : colorless crystals Solubility : soluble; water, methanol insoluble; chloroform, n-hexane Melting point : 257-263°C (dec.) Specific rotation : [α] 23 / D + 37.5° (C=1.0, methanol) Molecular formula : C₄₇H₆₁N₉O₁₉S₂Na₂ Elemental analysis : calcd. (C₄₇H₆₁N₉O₁₉S₂Na₂·6H₂O); C 44.30, H 5.77, N 9.89, S 5.03, Na 3.61 % found : C 44.98, H 5.90, N 10.06, S 5.00, Na 3.98 % Molecular weight : FAB-MS m/z 1188 (M+Na)⁺ Thin layer chromatography : Stationary phase Developing solvent Rf value silica gel (Merck Art 5715) CHCl₃-CH₃OH-H₂O (65 : 25 : 4) 0.11 n-butanol-acetic acid-water ( 4 : 2 : 1) 0.29 Infrared absorption spectrum (attached Fig. 1) : ν KBr / max 3360, 2960, 1735, 1660, 1640, 1530, 1500, 1380, 1250, 1200, 1060, 1030, 940, 890 cm⁻¹ ¹H Nuclear magnetic resonance spectrum (attached Fig. 2) : ¹³C Nuclear magnetic resonance spectrum (attached Fig.3): Amino acid analysis : Di-sodium salt of WS7622A di-sulfate (1 mg) was hydrolyzed with 6N HC1 (1 ml) at 110°C for 20 hours and the mixture was evaporated to dryness. The obtained mixture was analyzed on Hitachi 835 automatic amino acid analyzer. Amino acid standard solution [Type H (Wako Chemicals 013-08391) and Type B (Wako Chemicals 016-08641) were used.] were used as reference. As the result, threonine, valine, phenylalanine, ornithine, NH₃ and unknown ninhydrin-positive components were detected. Di-potassium salt of WS7622A di-sulfate : Appearance : colorless amorphous powder Solubility : soluble; water, methanol insoluble; chloroform, n-hexane Melting point : 230-237°C (dec.) Specific rotation : [α] 23 / D + 34° (C=1.0, methanol) Molecular formula : C₄₇H₆₁N₉O₁₉S₂K₂ Elemental analysis : calcd . (C₄₇H₆₁N₉O₁₉S₂K₂·6H₂O); C 43.21, H 5.63, N 9.65, S 4.91, K 5.99 % found : C 43.96, H 5.44, N 9.97, S 5.09, K 4.49 % Molecular weight : FAB-MS m/z 1236 (M+K)⁺ Thin layer chromatography : Stationary phase Developing solvent Rf value silica gel (Merck Art 5715) CHCl₃-CH₃OH-H₂O (65 : 25 : 4) 0.13 Infrared absorption spectrum (attached Fig. 4) : ν KBr / max 3360, 2960, 1735, 1660, 1640, 1530, 1500, 1405, 1380, 1250, 1200, 1050, 1030, 940, 890 cm⁻¹ ¹H Nuclear magnetic resonance spectrum (attached Fig. 5): (400MHz, D₂O) δ 7.52 (1H, s) 7.28 (1H, s) 7.34-7.25 (3H, m) 6.96 (1H, q, J=7Hz) 6.87 (2H, br d, J=8Hz) 5.56 (1H, m) 5.40 (1H, m) 4.84 (1H, br s) 4.70-4.55 (3H, m) 4.10 (1H, m) 4.03 (1H, m) 3.60 (1H, br d, J=14Hz) 3.50 (1H, m) 3.00 (3H, s) 3.00-2.85 (2H, m) 2.76 (1H, m) 2.62 (1H, m) 2.55-2.40 (2H, m) 2.12-1.95 (4H, m) 1.90-1.65 (3H, m) 1.79 (3H, d, J=7Hz) 1.53 (3H, d, J=6.5Hz) 1.45 (1H, m) 1.14 (6H, d, J=7Hz) 1.02 (3H, d, J=6.5Hz) 1.00 (3H, d, J=6.5Hz) Amino acid analysis : Di-potassium salt of WS7622A di-sulfate (1 mg) was hydrolyzed with 6N HCl (1 ml) at 110°C for 20 hours and the mixture was evaporated to dryness. The obtained mixture was analyzed on Hitachi 835 automatic amino acid analyzer. Amino acid standard solution [Type H (Wako Chemicals 013-08391) and Type B (Wako Chemicals 016-08641) were used.] were used as reference. As the result, threonine, valine, phenylalanine, ornithine, NH₃ and unknown ninhydrin-positive components were detected. A process according to claim 4, which comprises sulfating WS7622A or its salt in the presence of a base to give di-alkali metal salt of WS7622A di-sulfate. A process according to claim 5, wherein the di-alkali metal salt of WS7622A di-sulfate is di-sodium salt. Modification of the process claimed in any of claims 1 to 3 which is characterized by bringing the compounds or a non-toxic salt thereof, produced by the process claimed in any of claims 1 to 3 into pharmaceutical form by admixture or presentation of said compound with a pharmaceutical acceptable diluent or carrier.

Inventors: EZAKI MASAMI, HATANAKA HIROSHI, OKAMOTO MASANORI, OKUHARA MASAKUNI, SHIGEMATSU NOBUHARU, TAKASE SHIGEHIRO, TSUJII EISAKU, EZAKI, MASAMI, HATANAKA, HIROSHI, OKAMOTO, MASANORI, OKUHARA, MASAKUNI, SHIGEMATSU, NOBUHARU, TAKASE, SHIGEHIRO, TSUJII, EISAKU
Applicants: FUJISAWA PHARMACEUTICAL CO, FUJISAWA PHARMACEUTICAL CO., LTD.
Application year: 1991
Main classification: C07K2
IPC codes: C12P21, A61P29, A61P9, C12P1, C07K14, C12R1, C07K4, A61K38, A61K39, A61P11, C07K1