1-Naphthalenol, 4-[(4-nitrophenyl)azo]- 1-Naphthol, 4-[(p-nitrophenyl)azo]- 4-[(4-Nitrophenyl)azo]-1-naphthol 4-[(p-Nitrophenyl)azo]-1-naphthol 5290-62-0 Magneson II Magnezon II NSC5048 p-Nitrphenylazo-.alpha.-naphthol