1,3-Benzenediol, 4-[(4-nitrophenyl)azo]- 2,4-Dihydroxy-4'-nitroazobenzene 4-(p-Nitrophenylazo)resorcinol 4-[(4-Nitrophenyl)azo]-1,3-benzenediol 74-39-5 Magneson Magneson I Magnezon I NSC3914 Resorcinol, 4-[(p-nitrophenyl)azo]- p-Diazoviolet p-Nitrobenzeneazoresorcinol p-Nitrophenylazoresorcinol