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