Azido-PEG3-Val-Cit-PAB-OH 是一种可降解 (cleavable) 的含 3 个单元 PEG 的 ADC linker，可用于合成抗体偶联活性分子 (ADC)。Azido-PEG3-Val-Cit-PAB-OH 是一种点击化学试剂。它含有 Azide 基团，可以和含有 Alkyne 基团的分子发生铜催化的叠氮-炔环加成反应（CuAAc)。它还可以和含有 DBCO 或 BCN 基团的分子发生环张力驱动的炔-叠氮环加成反应 (SPAAC)。 Azido-PEG3-Val-Cit-PAB-OH is a cleavable ADC linker. The Val-Cit will specifically be cleaved by Cathepsin B. As this enzyme is only present in the lysosome, the ADC payload will be released only in the cell. Azido group will react with DBCO, BCN or other Alkyne group through click chemistry, PEG spacer increases aqueous solubility.