点击放大环状聚乙二醇-聚乙二醇臂-羟基（n=16）100-crown-33-PEG16-OH; Hydroxyl-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=16)
点击放大三臂-聚乙二醇-羟基（n=16）3-Arm-PEG16-OH; 3-Arm hydroxyl-functionalized discrete poly(ethylene glycol) (PEG arm n=16)
点击放大环状聚乙二醇-聚乙二醇臂-羧甲基（n=16）100-crown-33-PEG16-CH2COOH; Carboxylic acid-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=16)
