Amino-PEG11-COOtBu

Amino-PEG11-t-butyl ester is a click chemistry linker containing an amine and a t-butyl ester moiety. The hydrophilic PEG spacer increases solubility in aqueous media. The amino group is reactive with carboxylic acids, activated NHS esters, carbonyls (ketone, aldehyde) etc. The t-butyl protected carboxyl group can be deprotected under acidic conditions.