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)
点击放大环状聚乙二醇-聚乙二醇臂-NHS活性酯(n=16)100-crown-33-PEG16-CH2COONHS Ester; N-hydroxysuccinimide ester-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=16)