Azido-PEG4-Val-Ala-PAB is a cleavable ADC linker. The Val-Ala linkers can be cleaved by Cathepsin B. Azide (N3) group can react with alkyne, BCN, DBCO via Click Chemistry. PEG space improve compound's aqueous solubility. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.