Azido-PEG4-Val-Ala-PAB-PNP 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 spacer improves the compound's aqueous solubility. PNP is a good leaving group.
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