selective C-terminal deprotection of O-glycopeptide (methoxyethoxy)ethylesters is achieved under mild conditions (pH 6.6, 37 degrees C) by enzymatic hydrolysis using papain or lipase M from Mucor javanicus to give building blocks useful for chain-extending glycopeptide synthesis. On the other hand, the selective removal of acetyl protectinggroups from the saccharide portion of glycopeptides is accomplished