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Esterification with carboxylic acids and DCC followed by cleavage with hydrazines, amines and amine acid esters gave acyl hydrazides, amides and esters: Tetrahedron Lett., 35, 355 (1994); J. Med. Chem., 41, 1011 (1998); J. Org. Chem., 47, 3528 (1982), respectively. Diisocyanates can be monoprotected with this resin to form differentially substituted bis-ureas (no crosslinking of the reagent was observed): J. Org. Chem., 63, 4802 (1998)./n