点击放大环状聚乙二醇-聚乙二醇臂-巯基(n=12)76-crown-25-PEG12-SH; Thiol-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=12)
点击放大双臂-聚乙二醇-巯基(n=12)2-Arm-PEG-SH (n=12, per arm); 2-Arm thiol-functionalized discrete poly(ethylene glycol) (PEG arm n=12)
点击放大三臂-聚乙二醇-巯基(n=12)3-Arm-PEG-SH (n=12, per arm); 3-Arm thiol-functionalized discrete poly(ethylene glycol) (PEG arm n=12)