The molecule is a precorrin carboxylic acid anion obtained by global deprotonation of the carboxy groups of cobalt-precorrin-8. It is a conjugate base of a cobalt-precorrin-8.
cobalt;3-[(1R,2S,3S,4Z,7S,11S,17R,18R,19R)-8,13,17-tris(2-carboxylatoethyl)-2,7,18-tris(carboxylatomethyl)-1,2,5,7,11,12,15,17-octamethyl-10,15,18,19-tetrahydro-3H-corrin-21-id-3-yl]propanoate