methyl 3S-CBZ-amino-4S-BOC-aminopentanoate 生成 methyl 4-[[(2S)-2-[[(3S,4S)-3-amino-4-[[(2S)-3-(1H-imidazol-5-yl)-2-[[(2S)-2-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoyl]amino]propanoyl]amino]pentanoyl]amino]-3-methylpentanoyl]amino]-3-hydroxy-6-methylheptanoate