(Benzol-sulfonsaeure-(1))-(4 azo 4)-(4'-nitro-diphenylamin), 4-[4-(4-Nitro-anilino)-phenylazo]-benzolsulfonsaeure, EINECS 301-215-5, 4-[4-(4-nitro-anilino)-phenylazo]-benzenesulfonic acid, 4-[[4-[4-NITROPHENYL](PHENYLAMINO)]AZO]BENZENESULFONIC ACID, 4'-(4-Nitro-anilino)-azobenzol-sulfonsaeure-(4), 4-((4-(4-Nitrophenyl)anilino)azo)benzenesulphonic acid