Benzyl (3Z)-3-[(dimethylamino)methylene]-4-oxo-1-piperidinecarbox ylate

3,3-dimethyl-1,5-dioxa-9-azaspiro[5.5]undecane

螺[3H-吲哚-3,3'-吡咯烷]-2(1H)-酮

4-(2-乙氧基-2-氧代亚乙基)哌啶-1-羧酸苄酯

benzyl 2-amino-3-carbamoyl-5,7-dihydro-4H-thieno[2,3-c]pyridine-6-carboxylate