1,3-Diphenyl-4-(1-pyrrolidinylmethylene)-2-pyrazolin-5-one 1,3-Diphenyl-4-(N-pyrrolidinomethylene)-2-pyrazolin-5-one 2-Pyrazolin-5-one, 1,3-diphenyl-4-(1-pyrrolidinylmethylene)- 23711-44-6 5-25-15-00179 (Beilstein Handbook Reference) BRN 0690785