FMOC-Succinimide (FMOC-OSu) is a mixed carbamate reagent for the selective preparation of N-(9-fluorenylmethoxycarbonyl) derivatives of hydroxyamino acids and hydroxyamino acid esters in high yields. FMOC-OSu is a more preferable alternative to the use of the chloroformate, FMOC-Cl, because it eliminates the formation of dipeptides. FMOC-OSu has also been employed in the synthesis of glycopeptides.