(S)-2-tert-Butoxycarbonylamino-3-phenyl-propionic acid 6-((S)-2-tert-butoxycarbonylamino-3-phenyl-propionyloxy)-hexa-2,4-diynyl ester 、
三氟乙酸 以90%的产率得到(S)-2-Amino-3-phenyl-propionic acid 6-((S)-2-amino-3-phenyl-propionyloxy)-hexa-2,4-diynyl ester; compound with trifluoro-acetic acid