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Bis-PEG2-acid α,ω-dipropionic acid tetraethylene glycol Bis-PEG4-acid 2-[2-(2-methoxyethoxy)ethoxy]ethylamine 1-AMINO-3,6,9-TRIOXAUNDECANYL-11-OL NSC 361680 2-(2-(2-Aminoethoxy)ethoxy)acetic acid Fmoc-8-amino-3,6-dioxaoctanoic acid Boc-NH-PEG2-CH2COOH alpha-aMine-oMega-propionic acid hexaethylene glycol