点击放大环状聚乙二醇-聚乙二醇臂-马来酰亚胺（n=45）274-crown-91-PEG45-Mal; Mal-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=45)
点击放大Y型-双臂-甲氧基-聚乙二醇-马来酰亚胺（n=45）Y-(mPEG45)2-Mal; Y-shaped bis(methoxy-poly(ethylene glycol)) with a single Mal conjugation handle (PEG arm n=45)
点击放大双臂-聚乙二醇-马来酰亚胺（n=45）2-Arm-PEG-Mal (n=45, per arm); 2-Arm Mal-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大三臂-聚乙二醇-马来酰亚胺（n=45）3-Arm-PEG-Mal (n=45, per arm); 3-Arm Mal-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
