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Methoxy-PEG-COO-pNP, Mw 10,000  
Methoxy-PEG-COO-pNP, Mw 30,000
Methoxy-PEG-COO-pNP, Mw 5,000  
Methoxy-PEG-COO-pNP, Mw 20,000  
Methoxy-PEG-COO-pNP, Mw 2,000