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