6-(tert-Butoxy)-6-oxohexanoic NHS ester

6-(tert-Butoxy)-6-oxohexanoic NHS ester has a t-butyl ester group and an NHS ester moiety. The t-butyl group can be deprotected under acidic conditions. NHS ester can react specifically and efficiently with primary amines such as the side chain of lysine residues or aminosilane-coated surfaces at neutral or slightly basic condition to form a covalent bond.