The molecule is the dicarboxylate anion of protoporphyrin, obtained by deprotonation of both carboxy groups. It is a conjugate base of a protoporphyrin.
3-[18-(2-carboxylatoethyl)-8,13-bis(ethenyl)-3,7,12,17-tetramethyl-22,23-dihydroporphyrin-2-yl]propanoate