Norbornene PEG

4arm PEG, -((CH2)3NHCO-Norbornene)4, Mw 10,000

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4arm PEG, -((CH2)2O-CO-Norbornene)4, Mw 10,000

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4-arm PEG, -[(CH2)2O-(CH2)2-dicarboximide-Norbornene]4, MW 10,000

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