N-4-chlorobenzoyl-N-4-methoxyphenylalanine 、
γ-(p-Anisidino)-buttersaeuremethylester 以produces methyl N-[N-(p-chlorobenzoyl)-2-(p-anisidino)propionyl]-4-(p-anisidino)butyrate (oil), saponification of which and processing of the reaction product的产率得到methyl N-[N-(p-chlorobenzoyl)-2-(p-anisidino)propionyl]-4-(p-anisidino)butyrate