1,2-Diphenyl-4-((1-pyrrolidinyl)methylene)-3,5-pyrazolidinedione 1,2-Diphenyl-4-((N-pyrrolidino)methylene)-3,5-pyrazolidinedione 24665-81-4 3,5-Pyrazolidinedione, 1,2-diphenyl-4-((1-pyrrolidinyl)methylene)- 5-25-15-00486 (Beilstein Handbook Reference) BRN 0690862