1-(2-Oxopyrrolidin-1-yl)-1-(5-oxo-2-phenylpyrazolidin-1-yl)ethane 149775-61-1 2-(1-(2-Oxo-1-pyrrolidinyl)ethyl)-1-phenyl-3-pyrazolidinone 3-Pyrazolidinone, 2-(1-(2-oxo-1-pyrrolidinyl)ethyl)-1-phenyl-