6-(Difluoromethyl)-4-nitro-2-(trifluoromethoxy)-3-(trifluoromethyl)pyridine
4-(Difluoromethyl)-2-nitro-3-(trifluoromethoxy)-5-(trifluoromethyl)pyridine
3-(Difluoromethyl)-5-nitro-6-(trifluoromethoxy)-2-(trifluoromethyl)pyridine
3-(Difluoromethyl)-5-nitro-4-(trifluoromethoxy)-2-(trifluoromethyl)pyridine