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