上游原料
3-methyl-2-butenaldiethyl 2-[(benzyloxy)amino]malonatediethyl 3,3-dimethyl-2,2-pyrrolidinedicarboxylate3,3-dimethylprolinetert-butyl 2,4,5-trichlorophenyl carbonate1-(tert-butoxycarbonyl)-3,3-dimethylprolinetert-butyl 2-(aminocarbonyl)-3,3-dimethyl-1-pyrrolidinecarboxylate3,3-dimethyl-2-pyrrolidinecarboxamide(2S)-2-[([(2S)-1-[(benzyloxy)carbonyl]-5-oxopyrrolidinyl]carbonyl)amino]-3-(1H-imidazol-5-yl)propionic acid