3-(Difluoromethoxy)-2-(perchlorophenyl)-6-(trifluoromethyl)pyridine
2-(Difluoromethoxy)-3-(perchlorophenyl)-6-(trifluoromethyl)pyridine
2-(Difluoromethoxy)-3-(perchlorophenyl)-5-(trifluoromethyl)pyridine
5-(Difluoromethoxy)-2-(perchlorophenyl)pyridine