(S)-2-Benzyloxycarbonylamino-6-(2,2,2-trichloro-ethoxycarbonylamino)-hexanoic acid 2,5-dioxo-pyrrolidin-1-yl ester 、
(S)-4-Amino-4-((S)-1,3-dicarbamoyl-propylcarbamoyl)-butyric acid tert-butyl ester; compound with toluene-4-sulfonic acid 在
N-甲基吗啉 作用下,
以65%的产率得到Z-Lys(Troc)-Glu(OBut)-Gln-NH2