(2S)-2-hydroxy-3,3-dimethylbutanoic acid → 3-{4-[2-(2-Hydroxy-3,3-dimethyl-butyrylamino)-pentanoylamino]-imidazol-1-yl}-3-methyl-butyric acid methyl ester

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3-[4-(2-Amino-pentanoylamino)-imidazol-1-yl]-3-methyl-butyric acid methyl ester was coupled with (S)-2-hydroxy-3,3-dimethyl-butyric acid to provide the title compound: C13 NMR (100 MHz, CDCl3) 13.9, 19.1, 26.3, 28.1, 35.2, 35.3, 47.1, 51.9, 52.7, 56.4, 79.9, 105.0, 131.0, 137.6, 169.3, 170.1, 173.1; MS m/z 411.1 (M+1).

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