The molecule is a precorrin carboxylic acid anion that is a heptaanionic form of precorrin-5. Major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate base of a precorrin-5. It is a conjugate acid of a precorrin-5(8-).
3-[(2S,3S,4Z,7S,11S,17R)-1-acetyl-8,13,17-tris(2-carboxylatoethyl)-2,7,12,18-tetrakis(carboxylatomethyl)-2,7,11,17-tetramethyl-3,10,15,21-tetrahydrocorrin-22-ium-3-yl]propanoate