上游原料
2-(5-methyl-2-phenyl-1,3-oxazol-4-yl)-1-ethanolmethyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-(4-hydroxyphenyl)propanoatemethyl (2S)-2-[(tert-butoxycarbonyl)amino]-3-[4-[2-(5-methyl-2-phenyl-1,3-oxazol-4-yl)ethoxy]phenyl]propanoatemethyl (2S)-2-amino-3-[4-[2-(5-methyl-2-phenyl-1,3-oxazol-4-yl)ethoxy]phenyl]propanoatemethyl 2-oxocyclohexanecarboxylatemethyl 2-[((1S)-2-methoxy-1-[4-[2-(5-methyl-2-phenyl-1,3-oxazol-4-yl)ethoxy]benzyl]-2-oxoethyl)amino]-1-cyclohexene-1-carboxylatemethyl 2-[((1S)-2-methoxy-1-[4-[2-(5-methyl-2-phenyl-1,3-oxazol-4-yl)ethoxy]benzyl]-2-oxoethyl)amino]benzoate