2,4-二氧代吡咯烷-1-乙酸乙酯

硫酸

4-羟基-2-氧代-1-吡咯烷乙酸

ethyl (4-methoxy-2-oxopyrrolidin-1-yl)acetate

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