(E)-methyl 3-(1,2-dimethylhydrazinyl)but-2-enoate

2-甲基-4H-吡啶并[1,2-a]嘧啶-4-酮

(s)-3-boc-氨基丁酸甲酯

1,3-双(4-氯苯基)尿素

methyl 5-ethoxy-3-oxopentanoate