2-[[(2S)-4-methyl-2-[[2-[[(2S)-2-[[(2S)-4-methyl-2-[[(2S)-2-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylmethoxypropanoyl]amino]pentanoyl]amino]-3-phenylmethoxypropanoyl]amino]acetyl]amino]pentanoyl]amino]acetic acid;tetrahydrate 、
Boc-Cys(Tacm)-Asn-Val-Leu-Arg(Tos)-Arg(Tos)-Tyr(BrZ)-OBzl 以82%的产率得到