1-benzyl-3-(2-ethoxycarbonyl)ethylidene-2,5-piperazinedione

苄胺

1-benzyl-3-(3-hydroxypropyl)piperazine-2,5-dione

2-氧代戊烷-1,5-二甲酸二乙酯

diethyl 2-[(2-chloroacetyl)amino]pent-2-enedioate