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2-Oxo-3-(3-oxo-1,3-dihydro-2H-indol-2-ylidene)-2,3-dihydro-1H-indole-5-sulfonic acid CAS 244021-67-8 PubChem CID 3708
O=C1C(c2c(O)[nH]c3ccc(S(=O)(=O)O)cc23)=Nc2ccccc21