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