The molecule is a cyclic tetrapyrrole anion obtained by deprotonation of the four carboxy groups of coproporphyrin III; major species at pH 7.3. It is a conjugate base of a coproporphyrin III.
3-[8,13,18-tris(2-carboxylatoethyl)-3,7,12,17-tetramethyl-21,24-dihydroporphyrin-2-yl]propanoate