点击放大环状聚乙二醇-聚乙二醇臂-叠氮（n=12）76-crown-25-PEG12-N3; Azido-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=12)
点击放大双臂-聚乙二醇-叠氮（n=12）2-Arm-PEG-N3 (n=12, per arm); 2-Arm azido-functionalized discrete poly(ethylene glycol) (PEG arm n=12)
