Methyl 3-(difluoromethyl)-5-fluoro-4-methoxypyridine-2-acetate
Methyl 5-(difluoromethyl)-4-fluoro-2-methoxypyridine-3-acetate
Methyl 2-(difluoromethyl)-6-fluoro-4-methoxypyridine-3-acetate
Methyl 2-(difluoromethyl)-3-fluoro-6-methoxypyridine-5-acetate