2-(3-Chlorophenyl)-2,4-dihydro-5-methyl-3H-pyrazol-3-one 2-Pyrazolin-5-one, 1-(m-chlorophenyl)-3-methyl- (8CI) 3H-Pyrazol-3-one, 2-(3-chlorophenyl)-2,4-dihydro-5-methyl- 90-31-3 EINECS 201-984-6 NSC 166399