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四臂聚乙二醇琥珀酰亚胺戊二酸酯(酯键)(4-arm PEG-SG);4-arm Poly(ethylene glycol) succinimidyl glutarate
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四臂聚乙二醇马来酰亚胺(酰胺键)(4-arm PEG-MAL);4-arm Poly(ethylene glycol) maleimide
四臂聚乙二醇琥珀酰亚胺琥珀酸酯(酯键)(4-arm PEG-SCM);4-arm Poly(ethylene glycol) succinimidyl succinate
四臂聚乙二醇琥珀酰亚胺碳酸酯(4-arm PEG-SC)