2-(((4-Methoxyphenyl)methylhydrazono)methyl)-1,3,3-trimethyl-5-nitro-3H-indolium sulphate (2:1);4-methoxy-N-methyl-N-[(1,3,3-trimethyl-5-nitro-indol-1-ium-2-yl)methyleneamino]aniline sulfate
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