m-PEG3-S-PEG3-t-butyl ester，m-PEG3-S-PEG3-Boc

t-Boc-N-Amido-PEG11-Tos

Propargyl-PEG3-Sulfone-PEG3-propargyl

Tetrazine-PEG17-NHS ester

Ms-PEG13-t butyl ester

Methyltetrazine-PEG5-alkyne

Ms-PEG4-t-butyl ester

t-Boc-N-Amido-PEG2-Ms，Boc-N-PEG2-Ms

Tos-PEG5-t-butyl ester，Tos-PEG5-Boc

Propargyl-PEG2-Tos

TCO-PEG6-amine，TCO-PEG6-NH2

TCO-PEG8-TCO

TCO-PEG24-NHS ester

Propargyl-PEG4-Sulfone-PEG4-t-butyl ester，Propargyl-PEG4-Sulfone-PEG4-Boc

Thalidomide-O-PEG2-Acid

Tos-PEG2-CH2CO2tBu，Tos-PEG1-CH2-Boc

Bromo-PEG2-phosphonic acid diethyl ester

m-PEG5-phosphonic acid ethyl ester

MMAF-PEG4-amine TFA salt

Bis-sulfone-PEG8-NHS Ester