1,5-Dimethyl-4-nitroso-2-phenyl-1,2-dihydro-3H-pyrazol-3-one 3H-Pyrazol-3-one, 1,2-dihydro-1, 5-dimethyl-4-nitroso-2-phenyl- 885-11-0 AIDS-127444 AIDS127444 Antipyrine, 4-nitroso- NSC163932