(αZ)-α-Ethylidene-2-oxo-1-pyrrolidineacetic Acid is an intermediate in the synthesis of Dehydro Levetiracetam (Levetiracetam EP Impurity B) (D230275), which is an impurity of Levetiracetam (L331500) which is an (S)-enantiomer of Etiracetam (E932970) and the ethyl analog of Piracetam (P500800). Used as an anticonvulsant.