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