5-氧代己酸

(3R,5S,8aS)-1-benzyl-5-methyl-3-phenyloctahydroimidazo[1,2-a]pyridine

(6S)-(+)-6-methylpiperidin-2-one

(S)-(+)-N-(叔丁氧羰基)-2-甲基哌啶

(S)-2-methyl-1-((R)-1-phenylethyl)piperidine