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tetraphenyl porphyrin tetrasulfonic acid PubChem CID 136350475
O=S(=O)(O)C1=C(c2ccccc2)c2nc1c(S(=O)(=O)O)c1[nH]c(cc3nc(cc4[nH]c(c2-c2ccccc2)c(-c2ccccc2)c4-c2ccccc2)C=C3)c(S(=O)(=O)O)c1S(=O)(=O)O