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