SMILES: C[C@@]1([C@@H](C2=CC3=NC(=CC4=C(C(=C([N-]4)C=C5[C@@]([C@@H](C(=N5)C=C1[N-]2)CCC(=O)[O-])(C)CC(=O)N)CC(=O)[O-])CCC(=O)[O-])C(=C3CC(=O)[O-])CCC(=O)[O-])CCC(=O)[O-])CC(=O)N.[Ni]
Description: The molecule is a cyclic tetrapyrrole anion obtained by deprotonation of the carboxy groups of nickel-sirohydrochlorin a,c-diamide; major species at pH 7.3. It is a cyclic tetrapyrrole anion and a hexacarboxylic acid anion. It is a conjugate base of a nickel-sirohydrochlorin a,c-diamide.