点击放大双臂-聚乙二醇-羧乙基（n=4）2-Arm-PEG-CH2CH2COOH (n=4, per arm); 2-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=4)
点击放大三臂-聚乙二醇-羧乙基（n=4）3-Arm-PEG-CH2CH2COOH (n=4, per arm); 3-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=4)
点击放大四臂-聚乙二醇-羧乙基（n=4）4-Arm-PEG-CH2CH2COOH (n=4, per arm); 4-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=4)
点击放大六臂-聚乙二醇-羧乙基（n=4）6-Arm-PEG-CH2CH2COOH (n=4, per arm); 6-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=4)
点击放大八臂-聚乙二醇-羧乙基（n=4）8-Arm-PEG-CH2CH2COOH (n=4, per arm); 8-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=4)
