N-benzyl-N-[2-[benzyl(formyl)amino]ethyl]formamide

N-[2-[acetyl(benzyl)amino]ethyl]-N-benzylacetamide

1,4-二苄基-3-氧代哌嗪-2-羧酸乙酯

1,4-dibenzyl-1,4-diazepane-5,7-dione

3-氧代-4-(苯基甲基)-2-哌嗪羧酸乙酯