3-((1R)-1-phenyl-ethylamino)-piperidine-1,4-dicarboxylic acid 1-tert-butyl ester 4-ethyl ester

N-苄基-3-氧代哌啶-4-羧酸乙酯盐酸盐

N-Boc-3-氧代哌啶-4-甲酸乙酯