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