点击放大双臂-聚乙二醇-羧乙基（n=12）2-Arm-PEG-CH2CH2COOH (n=12, per arm); 2-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=12)
点击放大三臂-聚乙二醇-羧乙基（n=12）3-Arm-PEG-CH2CH2COOH (n=12, per arm); 3-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=12)
点击放大四臂-聚乙二醇-羧乙基（n=12）4-Arm-PEG-CH2CH2COOH (n=12, per arm); 4-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=12)
点击放大六臂-聚乙二醇-羧乙基（n=12）6-Arm-PEG-CH2CH2COOH (n=12, per arm); 6-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=12)
点击放大八臂-聚乙二醇-羧乙基（n=12）8-Arm-PEG-CH2CH2COOH (n=12, per arm); 8-Arm carboxylic acid-functionalized discrete poly(ethylene glycol) (PEG arm n=12)
点击放大环状聚乙二醇-聚乙二醇臂-羧甲基（n=12）76-crown-25-PEG12-CH2COOH; Carboxylic acid-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=12)
