The molecule is hexaanion of cob(II)yrinic acid arising from global deprotonation of the carboxy groups. It is a conjugate base of a cob(II)yrinic acid.
cobalt(2+);3-[(1R,2S,3S,5Z,7S,8S,10Z,13S,15Z,17R,18R,19R)-3,13,17-tris(2-carboxylatoethyl)-2,7,18-tris(carboxylatomethyl)-1,2,5,7,12,12,15,17-octamethyl-8,13,18,19-tetrahydro-3H-corrin-24-id-8-yl]propanoate