The molecule is a precorrin carboxylic acid anion obtained by deprotonation of the carboxy groups of cobalt-precorrin-5A; major species at pH 7.3. It is a conjugate base of a cobalt-precorrin-5A.
cobalt;3-[(4R,6Z,10S,14S,16Z,18S,19S)-4,8,13-tris(2-carboxylatoethyl)-3,9,14-tris(carboxylatomethyl)-4,10,14,19,23-pentamethyl-21-oxo-22-oxa-25,27-diaza-24,26-diazanidahexacyclo[15.6.1.12,5.17,10.112,15.01,19]heptacosa-2,5(27),6,8,12,15(25),16-heptaen-18-yl]propanoate