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4,4 -(21H,23H-Porphyrin-10,20-diyl)bis(benzenesulfonic acid) PubChem CID 15538982
O=S(=O)(O)c1ccc(-c2c3nc(cc4ccc([nH]4)c(-c4ccc(S(=O)(=O)O)cc4)c4ccc(cc5nc2C=C5)[nH]4)C=C3)cc1