4-[[Ethyl(3-methylphenyl)amino]methyl]benzenesulfonic acid, 4-((Ethyl(3-methylphenyl)amino)methyl)benzenesulphonic acid, Aethyl-(4-sulfo-benzyl)-m-toluidin, 4-(N-ethyl-m-toluidinomethyl)-benzenesulfonic acid, Benzenesulfonic acid,4-[[ethyl(3-methylphenyl)amino]methyl], 4-(N-Aethyl-m-toluidinomethyl)-benzolsulfonsaeure, 11-(Aethyl-m-toluidino)-toluol-sulfonsaeure-(4