By using hetero type activated PEGs, different molecules can be conjugated onto the each end of the PEGs. They are also useful for surface modification.
Branced heterofunctional PEGs Patent No. : JP5825507, US10040761
Mercapto-PEG-Amine, Hydrocholoride Salt
Boc-protected-Amino-PEG-Carboxylic Acid
9-Fluorenylmethyloxycarbonyl-protected-Amino-PEG-Carboxylic Acid
