1-[3-(L-asparaginyl)amino-2-hydroxy-4-phenylbutyryl]-4-chloro-N-t-butyl-L-prolinamide hydrochloride 、
6-Nitro-2-chinoxalincarbonsaeure 以190 mg of the title compound were obtained as a pale yellow powder, melting at 153°-156° C.的产率得到(4S)-1-{(2S,3S)-3-[N2-(6-nitro-2-quinoxalinecarbonyl)-L-asparaginyl]amino-2-hydroxy-4-phenylbutyryl}-4-chloro-N-t-butyl-L-prolinamide