m-PEG-bromide, MW 5,000 is a large PEG molecule containing a methoxy and a bromide. The methoxy group caps one end of the molecule to allow the PEGylation of a target molecule to proceed on only one end of this molecule at the terminal bromide. PEG linkers with high molecular weights such as this one are frequently employed in developing PEG-lipid conjugates such as the ones used to create lipid nanoparticles for drug delivery.
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