SMILES: CCC1=C(C2=NC1=CC3=C(C4=C(N3)C(=C5[C@H]([C@@H](C(=CC6=NC(=C2)C(=C6C)C=C)N5)C)CCC(=O)OC/C=C(\\C)/CCC[C@H](C)CCC[C@H](C)CCCC(C)C)C(=C4[O-])C(=O)OC)C)C
Description: The molecule is a cyclic tetrapyrrole anion that is the carbanion obtained by removal of the acidic proton from position 21 of pheophytin a. Major species at pH 7.3 It is a conjugate base of a pheophytin a.