1,3-dianilinonaphthalene-8-sulphonic acid, N.N'-Diphenyl-naphthylendiamin-(1.3)-sulfonsaeure-(8), 6,8-Dianilino-naphthalin-1-sulfonsaeure, 6,8-Dianilino-1-naphthalenesulfonic acid, 6,8-Diphenylamino-1-naphthalenesulfonic acid, 6,8-dianilino-naphthalene-1-sulfonic acid