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4arm PEG, -((CH2)2O-CO-Norbornene)4, Mw 10,000Chemical Name: Pentaerythritol tetra(5-norbornene-2-carbonyl)-polyoxyethyleneCAS#:
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4arm PEG, -((CH2)3NHCO-Norbornene)4, Mw 10,000Chemical Name: Pentaerythritol tetra{3-[(5-norbornene-2-carbonyl)amino]propyl}-polyoxyethylene