ethyl 3-amino-5-benzyl-1H-pyrrole-2-carboxylate

2,4-二甲基-5-乙氧羰基-3-吡咯丙酸乙酯

2-(叔丁氧基羰基)-3-氧代-3-苯基丙酸乙酯

6-amino-1,4,8,11-tetrazacyclotetradecane-5,7-dione

diethyl 2-(methylcarbamoylamino)propanedioate