点击放大环状聚乙二醇-聚乙二醇臂-羟基(n=8)52-crown-17-PEG8-OH; Hydroxyl-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=8)
点击放大三臂-聚乙二醇-羟基(n=8)3-Arm-PEG8-OH; 3-Arm hydroxyl-functionalized discrete poly(ethylene glycol) (PEG arm n=8)