Diisopropylcarbodiimide → 2-Methyl-2-[(4-{2-[(8-methylnonanoyl)amino]ethyl}-1,3-thiazol-2-yl)thio]propionic acid

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To a suspension of 2-{[4-(2-aminoethyl)-1,3-thiazol-2-yl]thio}-2-methylpropionic acid resin (0.30 g) synthesized in Example 483-3 in dimethylformamide (4.0 mL) were added HOBT monohydrate (0.092 g), diisopropylcarbodiimide (0.10 mL) and 8-methylnonanoic acid (0.10 g), and the mixture was stirred at room temperature overnight. The resin was collected by filtration from the reaction mixture, washed three times each with dimethylformamide, tetrahydrofuran and methanol, and vacuum dried to give 2-methyl-2-[(4-{2-[(8-methylnonanoyl)amino]ethyl}-1,3-thiazol-2-yl)thio]propionic acid resin.

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