1-Phenyl-2,3,4-trimethyl-3-pyrazolin-5-one 3-Pyrazolin-5-one, 1-phenyl-2,3,4-trimethyl- 3H-Pyrazol-3-one, 2,4-dihydro-1,4,5-trimethyl-2-phenyl- 4-Methylantipyrine 5-24-01-00373 (Beilstein Handbook Reference) 5677-84-9 BRN 0171007