The molecule is octaanion of precorrin-1 arising from global deprotonation of the carboxy groups. It is a conjugate base of a precorrin-1.
3-[(2S,3S,4Z)-8,12,17-tris(2-carboxylatoethyl)-3,7,13,18-tetrakis(carboxylatomethyl)-3-methyl-10,15,20,22,23,24-hexahydro-2H-porphyrin-2-yl]propanoate