72776-05-7
(S)-4-氧代-2-氮杂环丁烷羧酸苄酯
→
~96%
16404-94-7
(S)-(-)-4-氧代-2-吖丁啶羧酸
2791-79-9
L-天冬氨酸二苄酯
~93%
100188-44-1
methyl (S)-(-)-2-oxoazetidine-4-carboxylate
~82%