2093153-97-8

N-(Amino-PEG4)-N-bis(PEG4-t-butyl ester) is a branched PEG reagent containing an amino group with two t-butyl esters. The amino groups is reactive with carboxylic acids, activated NHS esters, carbonyls (ketone, aldehyde) etc. The t-butyl protected carboxyl group can be deprotected under acidic conditions.