2-Naphthalenesulfonic acid, 7-amino-4-(((4-methylphenyl)sulfonyl)oxy)- 68003-33-8 7-Amino-4-(((p-tolyl)sulphonyl)oxy)naphthalene-2-sulphonic acid 7-Amino-4-p-toluenesulfonato-2-naphthalenesulfonic acid EINECS 268-117-1