1-Ethoxycarbonylmethyl-3-(gamma-carboxypropyl)aminomethylenepyrrolidine-2,4-dione 1-Ethyl 3-(((3-carboxypropyl)amino)methylene)-2,4-dioxo-1-pyrrolidineacetate 1-Pyrrolidineacetic acid, 3-(((3-carboxypropyl)amino)methylene)-2,4-dioxo-, 1-ethyl ester 141581-94-4