1-Chloro-1,2-benziodoxol-3(1H)-one is an intermediate in the synthesis of 3-((5-Chloro-4-(pyridin-3-yl)pyrimidin-2-yl)amino)-4-methyl-N-(3-(4-methyl-1H-imidazol-1-yl)-5-(trifluoromethyl)phenyl)benzamide (C179120), an impurity of Nilotinib (N465300), which might be useful in treatment of chronic myelogenous leukemia.