CAS 531-91-9 appears in our catalog under these names: N,N'-DiphenylbenzidineN,N'-Diphenylbenzidine, >98% (HPLC), N,N'–Diphenylbenzidine, N,N'-Diphenylbenzidine, 98% , N,N'-Diphenylbenzidine, N,N'-Diphenylbenzidine, >98.0%(HPLC)(N). Offered by: Lumtec, GLPBio, Thermo Scientific (Alfa Aesar), Biosynth, TCI. Available pack sizes: On request, 100g, 25g, 5g, 0,1kg, 0,05kg, 10g, 50g.