The molecule is a steroid acid anion that is the conjugate base of (2Z,10Z)-3-hydroxy-5,17-dioxo-4,5-secoestra-2,10-diene-3-oic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. A meta-cleavage metabolite in the estrogen degradation pathway. It has a role as a bacterial metabolite. It is a conjugate base of a (2Z,10Z)-3-hydroxy-5,17-dioxo-4,5-secoestra-2,10-diene-3-oic acid.
(Z,4Z)-4-[(3aS,5aS,9aS,9bS)-3a-methyl-3,7-dioxo-2,4,5,5a,8,9,9a,9b-octahydro-1H-cyclopenta[a]naphthalen-6-ylidene]-1-hydroxy-1-oxobut-2-en-2-olate