点击放大环状聚乙二醇-聚乙二醇臂-羧甲基(n=24)148-crown-49-PEG24-CH2COOH; Carboxylic acid-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=24)
点击放大环状聚乙二醇-聚乙二醇臂-NHS活性酯(n=24)148-crown-49-PEG24-CH2COONHS Ester; N-hydroxysuccinimide ester-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=24)