点击放大双臂-聚乙二醇-羧乙基（n=45）2-Arm-PEG-CH2CH2COOH (n=45, per arm); 2-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大三臂-聚乙二醇-羧乙基（n=45）3-Arm-PEG-CH2CH2COOH (n=45, per arm); 3-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大四臂-聚乙二醇-羧乙基（n=45）4-Arm-PEG-CH2CH2COOH (n=45, per arm); 4-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大六臂-聚乙二醇-羧乙基（n=45）6-Arm-PEG-CH2CH2COOH (n=45, per arm); 6-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大八臂-聚乙二醇-羧乙基（n=45）8-Arm-PEG-CH2CH2COOH (n=45, per arm); 8-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大环状聚乙二醇-聚乙二醇臂-羧甲基（n=45）274-crown-91-PEG45-CH2COOH; Carboxylic acid-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=45)
