Fmoc-PEG2-Val-Cit-PAB-OH是一種酶可裂解的ADC接頭，具有Boc保護(hù)的胺、親水性PEG間隔區(qū)和Val-Cit-PAB二肽。PAB上的芐醇可用于連接反應(yīng)性基團(tuán)，如PNP，以與藥物有效載荷結(jié)合。Fmoc保護(hù)基可以用哌啶除去，以顯示用于偶聯(lián)反應(yīng)形成酰胺的伯胺。Val-Cit PAB被細(xì)胞蛋白酶切割，有效載荷有效釋放到細(xì)胞。

Fmoc-PEG2-Val-Cit-PAB-OH is an enzyme-cleavable ADC linker featuring a Boc-protected amine, a hydrophilic PEG spacer, and a Val-Cit-PAB dipeptide. The benzylic alcohol on the PAB can be used to attach with reactive groups such as PNP for conjugation with drug payloads. The Fmoc protecting group may be removed with piperidine to reveal a primary amine for use in coupling reactions to form amides. The Val-Cit-PAB is cleaved by cellular proteases for efficient release of payloads to the cell.