Ethyl 2-(difluoromethyl)-5-fluoro-3-hydroxypyridine-6-carboxylate
Methyl 3-(difluoromethyl)-2-fluoro-6-hydroxypyridine-4-acetate
Methyl 6-(difluoromethyl)-3-fluoro-2-hydroxypyridine-4-acetate
4-(Difluoromethyl)-3-fluoro-2-hydroxypyridine-6-acetic acid