点击放大环状聚乙二醇-聚乙二醇臂-羟基(n=96)580-crown-193-PEG96-OH; Hydroxyl-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=96)
点击放大双臂-聚乙二醇-羟基(n=96)2-Arm-PEG-OH (n=96, per arm); 2-Arm hydroxyl-functionalized discrete poly(ethylene glycol) (PEG arm n=96)
点击放大四臂-聚乙二醇-羟基(n=96)4-Arm-PEG-OH (n=96, per arm); 4-Arm hydroxyl-functionalized discrete poly(ethylene glycol) (PEG arm n=96)