1,3-Diphenyl-4-(4-methyl-1-piperazinylmethylene)-2-pyrazolin-5-one 1,3-Diphenyl-4-(N'-methyl-N-piperazino)methylene-2-pyrazolin-5-one 2-Pyrazolin-5-one, 1,3-diphenyl-4-(4-methyl-1-piperazinylmethylene)- 24665-76-7 5-25-15-00179 (Beilstein Handbook Reference) BRN 0709153