The molecule is a dicarboxylic acid dianion resulting from the removal of a proton from both of the carboxy groups of heme d trans-diol. It is a conjugate base of a heme d trans-diol.
3-[(17R,18R)-18-(2-carboxylatoethyl)-8,13-bis(ethenyl)-17,18-dihydroxy-3,7,12,17-tetramethylporphyrin-21,23-diid-2-yl]propanoate;iron