(Fluoro-4 phenyl)methyl-5 methyl-3 pyrrolidinone-2 [French] 2-Pyrrolidinone, 5-((4-fluorophenyl)methyl)-3-methyl- 5-((4-Fluorophenyl)methyl)-3-methyl-2-pyrrolidinone 97561-76-7 SR 41882