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