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Two analytical methods were developed, one utilizing sensitive UPLC-MS/MS method while other being the spectrophotometric method exploiting the Dushman reaction. Both methods were validated based on ICH guidelines and were successfully applied to quantitate the drug in marketed formulation. UPLC-MS/MS method responded linearly in the range of 1.6 µgmL -1 -6.4 µgmL -1 while spectrophotometric procedure followed the Beer's law in the concentration range of 30-100 µgmL -1 . UPLC-MS/MS has beendoi:10.1590/fst.07020 fatcat:rbms2ujwyndi5jxhknqto6hyzm