DBCO-NHCO-PEG4-NHS ester 是一种 PROTAC 连接桥，属于 PEG 类和 Alkyl/ether 类。DBCO-NHCO-PEG4-NHS ester 可用于合成一系列 PROTAC 分子。DBCO-NHCO-PEG4-NHS ester 是一种可降解 (cleavable) 的 ADC 连接桥，用于抗体活性分子结合物 (ADCs) 的合成。DBCO-NHCO-PEG4-NHS ester 是一种点击化学试剂。它含有 DBCO 基团，可以和含有 Azide 基团的分子发生环张力 (strain) 促进的炔-叠氮环加成反应 (SPAAC)。 DBCO-NHCO-PEG4-NHS ester is a PEG derivative containing NHS ester that is able to react specifically and efficiently with primary amines such as the side chain of lysine residues or aminosilane-coated surfaces at neutral or slightly basic condition to form a covalent bond. The hydrophilic PEG spacer arm improves water solubility and can also provide a long and flexible connection that minimizes steric hindrance during ligation. DBCO is commonly used for copper-free Click Chemistry reactions.