TCO-PEG-GGFG-COOH

Trans-cyclooctene-functionalized discrete poly(ethylene glycol)-glycyl-glycyl-phenylalanyl-glycine-carboxylic acid (TCO-PEG-GGFG-COOH) is an ADC linker intermediate containing a defined-length PEG spacer. It contains a trans-cyclooctene (TCO) reactive terminus and a glycine–glycine–phenylalanine–glycine tetrapeptide. Discrete chain lengths with different degrees of polymerization are available. Trans-cyclooctene can pair with tetrazines in inverse-electron-demand Diels–Alder reactions for assembly of bioorthogonal modules. 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.