点击放大环状聚乙二醇-聚乙二醇臂-氨基（n=16）100-crown-33-PEG16-NH2; Primary amine-terminated PEG arm on a cyclic poly(ethylene glycol) scaffold (arm n=16)
点击放大Y型-双臂-甲氧基-聚乙二醇-NHS活性酯（n=16）Y-(mPEG16)2-NHS; Y-shaped bis(methoxy-poly(ethylene glycol)) with a single N-hydroxysuccinimide ester conjugation handle (PEG arm n=16)
点击放大Y型-双臂-甲氧基-聚乙二醇-马来酰亚胺（n=16）Y-(mPEG16)2-Mal; Y-shaped bis(methoxy-poly(ethylene glycol)) with a single Mal conjugation handle (PEG arm n=16)
点击放大四臂-聚乙二醇-氨基（n=16）4-Arm-PEG16-NH2; 4-Arm primary amine-functionalized discrete poly(ethylene glycol) (PEG arm n=16)
