SMILES: CCC1=C(C2=NC1=CC3=C(C4=C([C@@H](C(=C5[C@H]([C@@H](C(=CC6=NC(=C2)C(=C6C)C=C)N5)C)CCC(=O)[O-])C4=N3)C(=O)[O-])O)C)C
Description: The molecule is dianion of 13(2)-carboxypyropheophorbide a arising from deprotonation of both carboxylic acid functions. It is a conjugate base of a 13(2)-carboxypyropheophorbide a.