点击放大环状聚乙二醇-聚乙二醇臂-羟基(n=45)274-crown-91-PEG45-OH; Hydroxyl-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=45)
点击放大三臂-聚乙二醇-羟基(n=45)3-Arm-PEG45-OH; 3-Arm hydroxyl-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大双臂-聚乙二醇-羟基(n=45)2-Arm-PEG-OH (n=45, per arm); 2-Arm hydroxyl-functionalized discrete poly(ethylene glycol) (PEG arm n=45)