1,3-Diphenylpyrazolone 2-Pyrazolin-5-one, 1,3-diphenyl- 3H-Pyrazol-3-one, 2,4-dihydro-2,5-diphenyl- 4845-49-2 5-Pyrazolone, 1,3-diphenyl- NSC59778 WLN: T5NNV DHJ BR& ER