Alkene-PEG-COOH
VA-PEG-VA
I-PEG-COOH
NB-PEG-COOH
PLGA(17K)-PEG-COOH
SG-PEG-COOH
SCM-PEG-COOH
SC-PEG-MTA
DBCO-PEG-COOH
COOH-PEG-HZ
Cy3-PEG-COOH
Acetylthio-PEG-COOH
COOH-PEG-PLA(10K)
NO2-Bn-PEG-COOH
CH2CH2COOH-PEG-CH2CH2COOH
Cy5-PEG-COOH
PLGA(1K)-PEG-COOH
COOH-PEG-CH2CH2COOtBu
Cy3.5-PEG-COOH
RB-PEG-COOH