The molecule is a bile acid anion resulting from deprotonation of the carboxy group of beta-muricholic acid (i.e. the conjugate base of beta-muricholic acid). It is the major species at pH 7.3. It is a conjugate base of a beta-muricholic acid.
(4R)-4-[(3R,5R,6S,7R,8S,9S,10R,13R,14S,17R)-3,6,7-trihydroxy-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