DBCO-PEG12-NHS ester 是一种 PROTAC linker，属于 PEG 类。可用于合成 PROTAC 分子。DBCO-PEG12-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-PEG12-NHS Ester is a PEG derivative containing an NHS ester moiety that can react specifically and efficiently with primary amines (e.g. 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 provides a long and flexible connection that minimizes steric hindrance involved with ligation. DBCO is commonly used for copper-free Click Chemistry reactions.