The molecule is octaanionic form of precorrin-4 arising from global deprotonation of the carboxy groups; major species at pH 7.3. It is a conjugate base of a precorrin-4.
3-[(2S,3S,4Z,7S,17R)-1-acetyl-8,13,17-tris(2-carboxylatoethyl)-2,7,12,18-tetrakis(carboxylatomethyl)-2,7,17-trimethyl-10,15,21,23-tetrahydro-3H-corrin-3-yl]propanoate