Plastic FilmChina N, N′-Diphenylbenzidine/[1, 1′-Biphenyl]-4, 4′-Diamine, N4, N4′-Diphenyl- / 531-91-9 / Chemical, Pharmaceutical, Find details about China CAS 531-91-9, Pharmaceuticals from N, N′-Diphenylbenzidine/[1, 1′-Biphenyl]-4, 4′-Diamine, N4, N4′-Diphenyl- / 531-91-9 / Chemical, Pharmaceutical