点击放大环状聚乙二醇-聚乙二醇臂-巯基(n=96)580-crown-193-PEG96-SH; Thiol-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=96)
点击放大双臂-聚乙二醇-巯基(n=96)2-Arm-PEG-SH (n=96, per arm); 2-Arm thiol-functionalized discrete poly(ethylene glycol) (PEG arm n=96)