N-acetyl-3-(2,6-dimethylanilino)propionic acid 、
γ-(2-Ethyl-6-methylanilino)buttersaeureethylester 以produces ethyl N-[N-acetyl-3-(2,6-dimethylanilino)propionyl]-4-(2-ethyl-6-methylanilino)butyrate (oil), saponification of which and processing of the reaction product的产率得到ethyl N-[N-acetyl-3-(2,6-dimethylanilino)propionyl]-4-(2-ethyl-6-methylanilino)butyrate