Pharmaceutically acceptable salts of betulinic acid derivatives

A salt of a compound selected from the group consisting of

• Arginine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Amino guanidine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Calcium salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Choline salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Dicyclohexylamine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Diethanolamine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• 2,6-dimethyl piperazine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Lithium salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Lysine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Magnesium salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• N-methyl Glucamine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• N-octyl Glucamine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid, piperazine salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Phenyl glycine methyl ester salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Phenyl glycinol salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Potassium salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Sodium salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Tris(hydroxymethyl)amino methane salt of 4-((1R,3aR,5aR,5bR,9S,11aR)-3a-((1R,3S)-2,2-dimethyl-3-(piperidine-1-carbonyl)cyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Sodium salt of 4-((1R,3aS,5aS,7aR,9S,11aR,11bS,13aR)-3a-((1S,3S)-2,2-dimethyl-3-(pyrrolidine-1-carbonyl)cyclobutylcarbamoyl)-5a,8,8,11a,13a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Potassium salt of 4-((1R,3aS,5aS,7aR,9S,11aR,11bS,13aR)-3a-((1S,3S)-2,2-dimethyl-3-(pyrrolidine-1-carbonyl)cyclobutylcarbamoyl)-5a,8,8,11a,13a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• N-methyl Glucamine salt of 4-((1R,3aS,5aS,7aR,9S,11aR,11bS,13aR)-3a-((1S,3S)-2,2-dimethyl-3-(pyrrolidine-1-carbonyl)cyclobutylcarbamoyl)-5a,8,8,11a,13a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)-2,2-dimethyl-4-oxobutanoic acid,
• Arginine salt of (1R,5bS,9S,11aR)-9-((1R,3S)-3-carboxy-2,2-dimethylcyclobutanecarbonyloxy)-5b,8,8,11a-tetramethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxylic acid,
• Choline hydroxide salt of (1R,5bS,9S,11aR)-9-((1R,3S)-3-carboxy-2,2-dimethylcyclobutanecarbonyloxy)-5b,8,8,11a-tetramethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxylic acid,
• Diethanolamine salt of (1R,5bS,9S,11aR)-9-((1R,3S)-3-carboxy-2,2-dimethylcyclobutanecarbonyloxy)-5b,8,8,11a-tetramethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxylic acid,
• Bis-N-methyl glucamine salt of (1R,5bS,9S,11aR)-9-((1R,3S)-3-carboxy-2,2-dimethylcyclobutanecarbonyloxy)-5b,8,8,11a-tetramethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxylic acid,
• Dipotassium salt of (1R,5bS,9S,11aR)-9-((1R,3S)-3-carboxy-2,2-dimethylcyclobutanecarbonyloxy)-5b,8,8,11a-tetramethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxylic acid, and
• Disodium salt of (1R,5bS,9S,11aR)-9-((1R,3S)-3-carboxy-2,2-dimethylcyclobutanecarbonyloxy)-5b,8,8,11a-tetramethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxylic acid.

A salt of a compound of formula (I):

• Wherein,
• R is OH,
• W is
• Salt is an arginine, amino guanidine, choline, dicyclohexylamine, diethanolamine, dimethyl piperazine, lithium, lysine, magnesium, N-octyl glucamine, piperazine, phenyl glycine methyl ester, phenyl glycinol, Trizma base primary standard buffer, or calcium, stereoisomers, enantiomers, diastereomers, racemates, or mixtures thereof.