7-methylidenebicyclo[2.2.1]hept-2-ene

亞甲去甲

叔-丁基4-亚甲基氮杂环庚烷-1-羧酸酯

4-methylidene-1-(4-nitrophenyl)piperidine

(S)-1-(叔丁氧基羰基)-2-甲基-4-亚甲基吡咯烷-2-羧酸