(S)-Benzyl 2-amino-6-((tert-butoxycarbonyl)amino)hexanoate hydrochloride

diethyl 7-bromoheptylphosphonate

Azido-PEG24-acid

Azido-PEG12-acid

diethyl 12-bromodecylphosphonate

Azido-PEG7-acid

Ald-Ph-PEG6-t-butyl ester，Ald-Ph-PEG6-Boc

Fmoc-N-amido-PEG11-CH2-aldehyde

Azido-PEG3-acid，N3-PEG3-CH2CH2COOH

Azido-PEG9-NHS ester

1,5-Bis-Boc-1,5,9-triazanonane

Azido-PEG7-NHS ester

Acid-PEG5-mono-methyl ester

Acid-PEG4-mono-methyl ester

Azido-PEG12-t-butyl ester，Azido-PEG12-Boc

Cbz-N-amido-PEG6-acid，Cbz-NH-PEG6-C2-acid

Azido-PEG16-NHS ester

5-(Azide-PEG9-ethylcarbamoyl)pentanoic t-butyl ester

Ald-CH2-PEG5-azide

DSS Crosslinker