3-氧代-4-哌啶甲酸乙酯

3-hydroxypiperidine-1,4-dicarboxylic acid 1-tert-butyl ester 4-ethyl ester

N-Boc-3-氧代哌啶-4-甲酸乙酯

二碳酸二叔丁酯

1,2,3,6-四氢-吡啶-4-羧酸盐酸盐