Bromo-PEG2-bromide is a PEG-based PROTAC linker can be used in the synthesis of PROTACs[1].
PROTACs contain two different ligands connected by a linker; one is a ligand for an E3 ubiquitin ligase and the other is for the target protein. PROTACs exploit the intracellular ubiquitin-proteasome system to selectively degrade target proteins[1].
[1]. Chen TH, et al. Metal-organic frameworks constructed from crown ether-based 1,4-benzenedicarboxylic acid derivatives. Dalton Trans. 2016 Feb 21;45(7):3063-9.