点击放大四臂-聚乙二醇-NHS活性酯（n=45）4-Arm-PEG45-CH2CH2COONHS Ester; 4-Arm N-hydroxysuccinimide ester-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大双臂-聚乙二醇-NHS活性酯（n=45）2-Arm-PEG-CH2CH2COONHS Ester (n=45, per arm); 2-Arm N-hydroxysuccinimide ester-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大三臂-聚乙二醇-NHS活性酯（n=45）3-Arm-PEG-CH2CH2COONHS Ester (n=45, per arm); 3-Arm N-hydroxysuccinimide ester-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
点击放大六臂-聚乙二醇-NHS活性酯（n=45）6-Arm-PEG-CH2CH2COONHS Ester (n=45, per arm); 6-Arm N-hydroxysuccinimide ester-functionalized discrete poly(ethylene glycol) (PEG arm n=45)
