1-[(2S,3S)-3-(L-asparaginylamino)-2-hydroxy-4-phenylbutyryl]-N-t-butyl-L-prolinamide hydrochloride 、
3-benzyloxycarbonylaminophenoxyacetic acid 以0.34 g of the title compound were obtained as a colorless powder, melting at 107°-117° C.的产率得到1-{(2S,3S)-3-[N2-(3-benzyloxycarbonylaminophenoxy)acetyl-L-asparaginyl]amino-2-hydroxy-4-phenylbutyryl}-N-t-butyl-L-prolinamide