Description Features and Benefits Azido-dPEG ®₄-TFP ester can be used to conjugate two different proteins or an antibody with a payload by using copper-catalyzed "click" chemistry with the azide to react with terminal alkynes or strained alkynes and by reaction of the TFP ester with a primary amine. Legal Information Products Protected under U.S. Patents # 7,888,536 B2 dPEG is a registered trademark of Quanta BioDesign