3-Hydroxy-4-nitro-5-(trifluoromethoxy)pyridine-2-sulfonamide
3-Hydroxy-2-nitro-5-(trifluoromethoxy)pyridine-4-sulfonamide
2-(Difluoromethyl)-5-hydroxy-3-(trifluoromethoxy)pyridine-6-acetic acid
2-(Difluoromethyl)-3-hydroxy-6-(trifluoromethoxy)pyridine-4-acetic acid