<prompt> Sodium 2 mercapto ethane sulfonate is used as a protective agent isRadiotherapyCancer chemotherapyLithotripsyHepatic encephalopathy  <response>: Refer KDT 6e p833 Sodium 2 mercapto ethane sulfonic acid is used to amelioreae the hemorrhagic cystitis caused by cycloohosphamide and Ifosfamide 