N3-PEG-GGFG-COOH

Azido-functionalized discrete poly(ethylene glycol)-glycyl-glycyl-phenylalanyl-glycine-carboxylic acid (N3-PEG-GGFG-COOH) is an ADC linker intermediate containing a defined-length PEG spacer. It contains an azide reactive terminus and a glycine–glycine–phenylalanine–glycine tetrapeptide. Discrete chain lengths with different degrees of polymerization are available. The azide can undergo copper-catalyzed click reactions with terminal alkynes or copper-free click conjugation with strained alkynes such as DBCO and BCN. The glycine–glycine–phenylalanine–glycine tetrapeptide provides a sequence variable for studies of protease-cleavable linkers. The terminal carboxyl group can be activated for coupling with amine-containing modules.

Customization available.