mPEG
mPEG
n
-CH
2
CH
2
COOH
mPEG
n
-CH
2
COOH
mPEG
n
-Mal
mPEG
n
-N
3
mPEG
n
-NH
2
mPEG
n
-NHS
mPEG
n
-OH
mPEG
n
-SH
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