ursodeoxycholic acid and its Impurities
Ursodeoxycholic acid. It works by reducing the amount of cholesterol released by your liver and by slowly dispersing the cholesterol.Reference standards of Ursodeoxycholic Acid API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.


Methyl (4R)-4-((3R,7S,8R,9S,10S,13R,14S)-3,7-dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Methyl (4R)-4-((3R,7S,8R,9S,10S,13R,14S)-3,7-dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Catalogue No.:PAI 21 004001
CAS :
NA
Molecular Formula : C25H42O4
Molecular Weight : 406.61


Methyl (4R)-4-((3R,7S,8R,9S,10S,13R,14S)-7-hydroxy-10,13-dimethyl-3-(tosyloxy)hexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Methyl (4R)-4-((3R,7S,8R,9S,10S,13R,14S)-7-hydroxy-10,13-dimethyl-3-(tosyloxy)hexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Catalogue No.:PAI 21 004002
CAS :
NA
Molecular Formula : C32H48O6S
Molecular Weight : 560.79


Methyl (4R)-4-((3S,7S,8R,9S,10S,13R,14S)-3,7-dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Methyl (4R)-4-((3S,7S,8R,9S,10S,13R,14S)-3,7-dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Catalogue No.:PAI 21 004003
CAS :
NA
Molecular Formula : C25H42O4
Molecular Weight : 406.61


(3R,7S,8R,9S,10S,13R,14S)-17-((R)-5-Methoxy-5-oxopentan-2-yl)-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthrene-3,7-diyl Diacetate
(3R,7S,8R,9S,10S,13R,14S)-17-((R)-5-Methoxy-5-oxopentan-2-yl)-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthrene-3,7-diyl Diacetate
Catalogue No.:PAI 21 004004
CAS :
NA
Molecular Formula : C29H46O6
Molecular Weight : 490.68


Methyl (4R)-4-((3R,7S,8R,9S,10S,13R,14S)-7-acetoxy-3-hydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Methyl (4R)-4-((3R,7S,8R,9S,10S,13R,14S)-7-acetoxy-3-hydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Catalogue No.:PAI 21 004005
CAS :
NA
Molecular Formula : C27H44O5
Molecular Weight : 448.64


Methyl (4R)-4-((7S,8R,9S,10S,13R,14S)-7-acetoxy-10,13-dimethyl-3-oxohexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Methyl (4R)-4-((7S,8R,9S,10S,13R,14S)-7-acetoxy-10,13-dimethyl-3-oxohexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Catalogue No.:PAI 21 004006
CAS :
NA
Molecular Formula : C27H42O5
Molecular Weight : 446.63


(R)-4-((3R,5R,7S,8R,9S,10S,13R,14S,17R)-3,7-Dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoic Acid
(R)-4-((3R,5R,7S,8R,9S,10S,13R,14S,17R)-3,7-Dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoic Acid
Catalogue No.:PA 21 0041010
CAS :
105227-28-9
Molecular Formula : C24H40O4
Molecular Weight : 392.58


Methyl (4R)-4-((3S,7S,8R,9S,10S,13R,14S)-7-acetoxy-3-hydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Methyl (4R)-4-((3S,7S,8R,9S,10S,13R,14S)-7-acetoxy-3-hydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoate
Catalogue No.:PA 21 0041007
CAS :
NA
Molecular Formula : C27H44O5
Molecular Weight : 448.64


(R)-3-((3R,5S,7S,8R,9S,10S,12S,13R,14S,17R)-3,7,12-Trihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)butanoic Acid
(R)-3-((3R,5S,7S,8R,9S,10S,12S,13R,14S,17R)-3,7,12-Trihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)butanoic Acid
Catalogue No.:PA 21 0041011
CAS :
139265-35-3
Molecular Formula : C23H38O5
Molecular Weight : 394.55


((R)-4-((3R,5R,8R,9S,10S,13R,14S,17R)-3-Hydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoyl)-L-asparagine
((R)-4-((3R,5R,8R,9S,10S,13R,14S,17R)-3-Hydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoyl)-L-asparagine
Catalogue No.:PA 21 0041015
CAS :
1428095-38-8
Molecular Formula : C28H46N2O5
Molecular Weight : 490.69


(R)-4-((3R,5S,7S,8R,9S,10S,13R,14S,17R)-3,7-Dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pent-2-enoic Acid
(R)-4-((3R,5S,7S,8R,9S,10S,13R,14S,17R)-3,7-Dihydroxy-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pent-2-enoic Acid
Catalogue No.:PA 21 0041018
CAS :
163750-00-3
Molecular Formula : C24H38O4
Molecular Weight : 390.56


(4R)-4-((3R,5S,8S,9S,10S,13R,14S,17R)-6-Ethyl-3-hydroxy-10,13-dimethyl-7-oxohexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoic Acid
(4R)-4-((3R,5S,8S,9S,10S,13R,14S,17R)-6-Ethyl-3-hydroxy-10,13-dimethyl-7-oxohexadecahydro-1H-cyclopenta[a]phenanthren-17-yl)pentanoic Acid
Catalogue No.:PA 21 0041020
CAS :
1892540-33-8
Molecular Formula : C26H42O4
Molecular Weight : 418.62