mPEG
Methoxy-PEG or mPEG is a PEG chain having one functional group blocked with a methyl group. mPEG and mPEG derivatives are therefore useful for modification of compounds where cross-linking should be avoided.
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mPEG derivative
The methoxy-PEG, or mPEG, is modifed on its free end to provide a range of useful derivatives. The absence of bis-functional impurities is ensured by chromatographic purification.