Reagent for peptide coupling in the presence of triethylamine in DMF, via the p-nitrophenyl active ester: Liebigs Ann. Chem., 655, 189 (1962); Helv. Chim. Acta, 46, 795 (1963). Has also been used as a coupling reagent in the synthesis of carbamate linked cytosine oligomers: J. Org. Chem., 52, 4202 (1987), and of ureido sugars: Carbohydr. Res., 203, 302 (1990).
