2-(2-oxopyrrolidin-1-yl)butanamide ; alpha-Ethyl-2-oxo-1-pyrrolidineacetic acid; ETHYL 2-OXO-1-PYRROLIDINEACETATE; Ethyl (2-oxopyrrolidin-1-yl)acetate; ethyl 2-(2-oxopyrrolidin-1-yl)acetate
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