tert-butyl 7-fluoro-4-oxospiro[3H-chromene-2,4'-piperidine]-1'-carboxylate

6-氨基-4-氧代螺[苯并二氢吡喃-2,4-哌啶]-1-羧酸叔丁酯

N-Boc-7-溴-4-氧代-3,4-二氢-1H-螺[色烯-2,4-哌啶]

4-[(4-甲基-2-吡啶基)氨基]-1-哌啶甲酸叔丁酯

tert-butyl 4-chloro-6,8-dihydro-5H-pyrido[2,3]thieno[2,4-d]pyrimidine-7-carboxylate