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