2,5-dioxopyrrolidin-1-yl 6-bromohexanoate is an alkane linker with a terminal bromide and an NHS ester. The bromide is a very good leaving group for nucleophilic substitution reactions. The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules.
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