Trityl-PEG8-azide

t-Boc-N-amido-PEG1-CH2CO2H，Boc-NH-PEG1-CH2COOH

Propargyl-PEG1-SS-PEG1-PFP ester

m-PEG2-NHS ester

Acid-PEG25-Amide-Tri(3-methoxypropanamide-PEG10-Azide) Methane

Fmoc-PEG3-NHS ester，Fmoc-PEG3-C2-NHS ester

m-PEG3-4-nitrophenyl carbonate

Mal-PEG4-Val-Cit-PAB-PNP

5-(tetrahydro-2H-pyran-2-yloxy)pent-3-yn-1-PEG4-azide

N-Desthiobiotin-N-bis(PEG4-NHS ester)

m-PEG7-azide

Azido-PEG4-oxazolidin-2-one

PEG22，HO-PEG21-OH

m-PEG12-t-butyl ester，m-PEG12-Boc

Mal-PEG4-Lys(TFA)-NH-m-PEG24

BCN-PEG3-VC-PFP Ester

Amino-PEG3-t-butyl ester，NH2-PEG3-C2-Boc

t-Boc-N-amido-PEG2-acid，Boc-NH-PEG2-CH2CH2COOH

m-PEG7-4-nitrophenyl carbonate

Fluorescein-PEG4-azide，Fluorescein-thiourea-PEG4-azide