点击放大环状聚乙二醇-聚乙二醇臂-羟基(n=64)388-crown-129-PEG64-OH; Hydroxyl-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=64)
点击放大环状聚乙二醇-聚乙二醇臂-氨基(n=64)388-crown-129-PEG64-NH2; Primary amine-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=64)