BCN-PEG-Ala-Ala-Asn-PAB-OH

Bicyclononyne-functionalized discrete poly(ethylene glycol)-alanyl-alanyl-asparagine-p-aminobenzyl alcohol (BCN-PEG-Ala-Ala-Asn-PAB-OH) is an ADC linker intermediate containing a defined-length PEG spacer. It contains a bicyclononyne (BCN) reactive terminus and an alanine–alanine–asparagine tripeptide. 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 alanine–alanine–asparagine tripeptide 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.