英文别名
                        N-(3-Ethoxycarbonylmethylmercapto-propyl)-pyrrolidon-2;N-(3-Ethoxycarbanylmethylmercapto-propyl)-pyrrolidon-2;[3-(2-oxo-pyrrolidin-1-yl)-propylsulfanyl]-acetic acid ethyl ester;1-[3-[(Ethoxycarbonyl)methylthio]propyl]-2-pyrrolidone;ethyl 2-[3-(2-oxopyrrolidin-1-yl)propylsulfanyl]acetate