2-Pyrazolin-5-one, 3-methyl-4-(4-methyl-1-piperazinylmethylene)-1-phenyl- 23746-39-6 3-Methyl-4-(4-methyl-1-piperazinylmethylene)-1-phenyl-2-pyrazolin-5-one 3-Methyl-4-(N'-methyl-N-piperazino)methylene-1-phenyl-2-pyrazolin-5-one 5-25-14-00511 (Beilstein Handbook Reference) BRN 0810999