The molecule is a precorrin carboxylic acid anion obtained by deprotonation of the carboxy groups of cobalt-precorrin-3; major species at pH 7.3. It is a conjugate base of a cobalt-precorrin-3.
cobalt;3-[(1Z,2S,3S,4Z,7S,8S,9Z)-7,13,17-tris(2-carboxylatoethyl)-3,8,12,18-tetrakis(carboxylatomethyl)-3,8,10-trimethyl-2,7,15,18-tetrahydroporphyrin-21,23-diid-2-yl]propanoate