点击放大Y型-双臂-甲氧基-聚乙二醇-NHS活性酯(n=64)Y-(mPEG64)2-NHS; Y-shaped bis(methoxy-poly(ethylene glycol)) with a single N-hydroxysuccinimide ester conjugation handle (PEG arm n=64)
点击放大四臂-聚乙二醇-NHS活性酯(n=64)4-Arm-PEG64-CH2CH2COONHS Ester; 4-Arm N-hydroxysuccinimide ester-functionalized discrete poly(ethylene glycol) (PEG arm n=64)