8-Bromo-octanoic acid 2,5-dioxo-pyrrolidin-1-yl ester is a chemical reagent featuring a bromide and an NHS ester at opposing ends of a saturated C8 chain. Bromide is easily displaced by nucleophiles such as amines, while the NHS ester readily reacts with amines under mild conditions. Compounds such as this may be used as intermediates in building lipids for use in lipid nanoparticles.