Maleimide PEG

2arm PEG, -((CH2)2NHCO(CH2)2-MAL)2, Mw 20,000

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2arm PEG, -((CH2)2NHCO(CH2)2-MAL)2, Mw 40,000

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4arm PEG, -((CH2)3NHCO(CH2)2-MAL)4, Mw 5,000

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