二碳酸二叔丁酯

L-天冬氨酸-4-苄酯

N-Boc-L-aspartic acid (β-benzyl) α-phenacyl ester

2-tert-butoxycarbonylamino-succinic acid 4-benzyl ester 1-(2-cyano-ethyl) ester

α-picolyl N-Boc-L-aspartate(OBn)