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1H-Indole-5,7-disulfonic acid, 2-(1,3-dihydro-3-oxo-5,7-disulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-, potassium salt (1:4) CAS 28699-96-9 PubChem CID 135537156
O=C1C(c2[nH]c3c(S(=O)(=O)[O-])cc(S(=O)(=O)[O-])cc3c2O)=Nc2c1cc(S(=O)(=O)[O-])cc2S(=O)(=O)[O-].[K+].[K+].[K+].[K+] -
tetrapotassium 3-oxo-2-(3-oxo-5,7-disulfonato-1H-indol-2-ylidene)-1H-indole-5,7-disulfonate hydrate CAS 28699-96-9 PubChem CID 136636098
O.O=C1C(c2[nH]c3c(S(=O)(=O)[O-])cc(S(=O)(=O)[O-])cc3c2O)=Nc2c1cc(S(=O)(=O)[O-])cc2S(=O)(=O)[O-].[K+].[K+].[K+].[K+]