(4-((4,6-Diamino-m-tolyl)imino)-2,5-cyclohexadien-1-ylidene)dimethylammonium chloride H2O 6424-34-6 Ammonium, (4-((4,6-diamino-m-tolyl)imino)-2,5-cyclohexadien-1-ylidene)dimethyl-, chloride, monohydrate Toluylene Blue monohydrate