(R)-4-({[(S)-2-(N'-Acetyl-hydrazino)-1-benzyl-2-oxo-ethylcarbamoyl]-methyl}-carbamoyl)-4-[(S)-2-benzyloxycarbonylamino-3-(4-hydroxy-phenyl)-propionylamino]-butyric acid methyl ester 、
(S)-N-[(R)-1-({[(S)-2-(N'-Acetyl-hydrazino)-1-benzyl-2-oxo-ethylcarbamoyl]-methyl}-carbamoyl)-2-phenyl-ethyl]-2-amino-3-(4-hydroxy-phenyl)-propionamide 、 、
盐酸 以
甲醇 为溶剂,
以the desired compound (0.28 g) is obtained in a similar manner to (III) of Example 47, Rf2 =0.27, [α]D23 +17.5° (c=0.38, MeOH), Aminoacid analysis (hydrolized with HCl)的产率得到(R)-4-({[(S)-2-(N'-Acetyl-hydrazino)-1-benzyl-2-oxo-ethylcarbamoyl]-methyl}-carbamoyl)-4-[(S)-2-amino-3-(4-hydroxy-phenyl)-propionylamino]-butyric acid methyl ester