Mal-PEG4-alcohol，Mal-PEG4-OH

Methyltetrazine-PEG4-maleimide

Methylamino-PEG3-azide

N-(Boc-PEG5)-N-bis(PEG4-acid)

Bis-Mal-PEG3

Bis-Mal-Lysine-PEG4-TFP ester

Bromoacetamido-PEG8-t-butyl ester，Bromoacetamido-PEG8-Boc

m-PEG24-Mal

Lipoamido-PEG24-acid

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

Fmoc-NH-PEG12-CH2COOH

Chloroacetamido-PEG4-NHS ester，丙烯酸琥珀酰亚胺-四聚乙二醇-氯乙酰胺

m-PEG24-azide

m-PEG8-acid，m-PEG8-CH2CH2COOH

N-Boc-PEG1-bromide，t-boc-N-amido-PEG2-bromide

Mal-amido-PEG2-NHS，Maleimide-PEG2-NHS Ester

Bromoacetamido-PEG3-t-butyl ester，Bromoacetamido-PEG3-C2-Boc

Bromo-PEG5-t-butyl ester，Bromo-PEG5-Boc

Ald-Ph-PEG4-NHS ester，Ald-Ph-amido-PEG4-C2-NHS ester

Azido-PEG4-oxazolidin-2-one