5-[4-Chloro-3-(trifluoromethoxy)phenyl]-2-furancarboxylic Acid is an impurity of 5-[2-(Trifluoromethoxy)phenyl]-2-furancarboxylic Acid (T790925); a reagent in the synthesis of (phenyl)-N-[(mercapto)(pyrrolyl)triazolyl]furancarboxamide and (phenoxy)-N-[(mercapto)(pyrrolyl)triazolyl]acetamide derivatives as herbicides.