• CAS No.：
  77544-60-6
• Synonyms：
  Tetraethyleneglycol monotosylate
  2-[2-[2-(2-Hydroxyethoxy)ethoxy]ethoxy]ethyl tosylate
  Tetraethylene glycol p-toluenesulfonate
  
• Purity：
  ≥95%
• MF：
  C₁₅H₂₄O₇S
• MW：
  348.412
• Recommended Storage Condition：
  Store at -5°C,keep in dry and avoid sunlight.
• Uses：
  

Tetraethylene glycol monotosylate (OH-PEG4-Tos) is a cleavable and acylhydrazone-based ADC linker used in the synthesis of antibody-drug conjugates (ADCs). And it also can be used as a PROTAC linker that can be used in the synthesis of PROTACs.  

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References:
1. ​Park KD, et al. Useful tools for biomolecule isolation, detection, and identification: acylhydrazone-based cleavable linkers.Chem Biol. 2009 Jul 31;16(7):763-72.