• CAS No.：
  944251-24-5
• Synonyms：
  Azido-PEG4-NHS
  Azido-PEG4-NHS ester
  N3-PEG4-CH2CH2COONHS
  N3-PEG4-C2-NHS ester
  
• Purity：
  ≥95%
• MF：
  C₁₅H₂₄N₄O₈
• MW：
  388.37
• Recommended Storage Condition：
  Store at -5°C,keep in dry and avoid sunlight.
• Uses：
  Applicated in medical research, drug-release, nanotechnology and new materials research, cell culture. In the study of ligand, polypeptide synthesis support, a graft polymer compounds, new materials, and polyethylene glycol-modified functional coatings and other aspects of the active compound.

N3-PEG4-SPA (Azido-PEG4-NHS Ester) is a heterobifunctional PEG linker containing an azide group and an NHS ester. The azide group enables Click Chemistry reactions with alkyne, BCN, or DBCO groups, forming stable triazole linkages. The NHS ester is highly reactive with primary amines, facilitating the formation of stable amide bonds with proteins, peptides, and other amine-containing molecules.

N3-PEG4-SPA is a noncleavable PEG linker essential for the synthesis of antibody-drug conjugates (ADCs).

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