2-(((4-((4-(Diethylamino)-2-methylphenyl)azo)-2,5-dichlorophenyl)sulfonyl)amino)ethanesulfonic acid 36783-07-0 Ethanesulfonic acid, 2-(((2,5-dichloro-4-((4-(diethylamino)-2-methylphenyl)azo)phenyl)sulfonyl)amino)-