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In this work we describe, for the first time, a rapid and efficient method for 17O selective labeling on the β-carboxyl group of an aspartic acid residue already incorporated into a peptide sequence anchored on a solid-phase support. The β-O-benzyl ester of the Asp residue of the Ac-RGD-benzydrylamine resin was successfully saponified using Na17OH in a methanol/dichloromethane mixture. The 17O selective...
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