BCN-PEG-Val-Ala-PAB-OH

Bicyclononyne-functionalized discrete poly(ethylene glycol)-valyl-alanine-p-aminobenzyl alcohol (BCN-PEG-Val-Ala-PAB-OH) is an ADC linker intermediate containing a defined-length PEG spacer. It contains a bicyclononyne (BCN) reactive terminus and a valine–alanine dipeptide. Discrete chain lengths with different degrees of polymerization are available. BCN is a strained alkyne that can undergo copper-free cycloaddition with azides, allowing comparisons of different strained-alkyne conjugation termini. The valine–alanine dipeptide provides a sequence variable for studies of protease-cleavable linkers. The PAB spacer links peptide cleavage to the subsequent self-immolation process. The PAB hydroxyl group retains a synthetic handle for subsequent activation and payload derivatization.

Customization available.