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Formation of adamantyl esters has been used to block the ß-carboxyl group of aspartic acid in peptide synthesis. The 2-adamantyl ester is prepared using DCC-DMAP, is stable to TFA but can be cleaved with methanesulfonic acid: J. Chem. Soc., Perkin 1, 2129 (1988). See also Appendix 6./n