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Attachment of carboxylic acids can be achieved by DMAP catalyzed esterification with the symmetrical anhydride or 2,6-dichlorobenzoyl chloride and pyridine: Tetrahedron Lett.. 28 6147 (1987). Attachment of phenols can be brought about using the Mitsunobu reaction: Tetrahedron Lett., 38, 4021 (1997)./n