tert-butyl 2-[({(2R,3S)-2-hydroxy-3-[((2S)-3-methyl-2-{3-[(2-methyl-1,3-thiazol-4-yl)methyl]-2-oxoimidazolidin-1-yl}butanoyl)amino]-4-phenylbutyl}amino)methyl]pyrrolidine-1-carboxylate