GS2 Type (NHS-ester PEG)

2arm branched PEG, -(CH2)3NHCO(CH2)3COO-NHS, Mw 20,000
2arm branched PEG, -(CH2)3NHCO(CH2)3COO-NHS, Mw 40,000
2arm branched PEG, -(CH2)3NHCO(CH2)3COO-NHS, Mw 60,000
2arm branched PEG, -(CH2)3NHCO(CH2)3COO-NHS, Mw 80,000

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