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The title molecule, C11H6F5NO, lies on a mirror plane in the orthorhombic unit cell, with only two F atoms each of the difluoro and trifluoromethyl substituents lying out of the plane. In the crystal, molecules are linked by C—H...O, C—H...N and C—H...F hydrogen bonds, forming a layer structure parallel to the (001) plane. Weak π–π interactions promote the formation of a three-dimensional network.