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tetraphenylporphine sulphonate PubChem CID 137225555
O=S([O-])OC1=C(c2ccccc2)c2nc1cc1ccc(cc3nc(cc4[nH]c(c2-c2ccccc2)c(-c2ccccc2)c4-c2ccccc2)C=C3)[nH]1