Methyltetrazine-PEG12-acid

Methyltetrazine-amido-PEG7-azide

Diazo-PEG3-methyltetrazine

Methyltetrazine-PEG4-amine HCl salt

(2-pyridyldithio)-PEG4-alcohol

Methyltetrazine-PEG8-amine HCl salt

Methyltetrazine-PEG3-amine

DBCO-PEG4-Me-Tetrazine

Methyltetrazine-PEG5-NHS ester

Desthiobiotin-PEG4-Alkyne

Lipoamido-PEG12-acid

S-acetyl-PEG4-t-butyl ester，S-acetyl-PEG4-Boc

DBCO intermidate 3

S-acetyl-PEG2-t-butyl ester，S-acetyl-PEG2-Boc

Alkyne maleimide，Mal-Alkyne

Methyltetrazine-PEG24-NH-Boc

Propargyl-PEG1-NHBoc

Lipoamido-PEG8-acid

S-acetyl-PEG12-alcohol

Tetrazine-PEG5-NHS ester