Methyl 4-hydroxy-3-nitro-2-(trifluoromethoxy)pyridine-5-acetate
Methyl 4-hydroxy-2-nitro-3-(trifluoromethoxy)pyridine-5-acetate
Methyl 5-(difluoromethyl)-2-hydroxy-3-(trifluoromethoxy)pyridine-6-acetate
Methyl 3-(difluoromethyl)-2-hydroxy-6-(trifluoromethoxy)pyridine-4-acetate