3,4-环氧丁酸甲酯

butyl (4-hydroxy-2-oxopyrrolidin-1-yl)acetate

2-(4-hydroxypyrrolidin-2-on-1-yl)-ethyl acetate

ethyl (2,5-dihydro-4-methoxy-2-oxo-1H-pyrrol-1-yl)acetate

2-(5-oxo-3-phenylmethoxy-2H-pyrrol-1-yl)acetamide