3,3'-(((4-(Diethylamino)phenyl)methylene)bis((3-methyl-4,1-phenylene)(ethylimino)methylene))bis(benzenesulphonic) acid 68959-36-4 Benzenesulfonic acid, 3,3'-(((4-(diethylamino)phenyl)methylene)bis((3-methyl-4,1-phenylene)(ethylimino)methylene))bis- EINECS 273-414-4