"These groups include, for example, nucleophiles such as hydroxyl, amino, hydrazine, hydrazide, or thio, and electrophiles such as carboxylic acids; carboxylic esters or carbonates, including imide esters or carbonates, imidazoyl ester or carbonate, and benzotriazole ester or carbonate; orthoesters; isocyanates; isothiocyanates; aldehydes, including glyoxal; ketones, including diones; thiones; alke" . . . .