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