The molecule is a steroid acid anion that is the conjugate base of isoursodeoxycholic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of an isoursodeoxycholic acid.
(4R)-4-[(3S,5S,7S,8R,9S,10S,13R,14S,17R)-3,7-dihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoate