(R)-2-(1-tert-butoxycarbonyl-piperidin-4-yl)-thiazolidine-3,4-dicarboxylic acid 3-benzyl ester

4-{(R)-3-benzyloxycarbonyl-4-[4-(4-cyclopropylcarbamoyl-phenyl)-thiazol-2-ylcarbamoyl]-thiazolidin-2-yl}-piperidine-1-carboxylic acid tert-butyl ester