Axispharm provides you with high purity 6-(tert-butoxy)-6-oxohexanoic acid NHS esters with both a tert-butyl ester group and an NHS ester moiety. The tert-butyl group can be deprotected under acidic conditions. NHS esters can react specifically and efficiently with primary amines such as the side chains of lysine residues or aminosilane-coated surfaces to form covalent bonds under neutral or slightly basic conditions.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.