Synonyms: Ammonium,[4-[(4,6-diamino-m-tolyl)imino]-2,5-cyclohexadien-1-ylidene]dimethyl-,chloride, monohydrate (8CI); Methanaminium,N-[4-[(2,4-diamino-5-methylphenyl)imino]-2,5-cyclohexadien-1-ylidene]-N-methyl-,chloride, monohydrate (9CI); Toluylene blue monohydrate