Methyl 3-(difluoromethyl)-5-hydroxy-6-nitropyridine-2-acetate
2-(Chloromethyl)-3-(difluoromethyl)-4-hydroxypyridine-6-acetic acid
Methyl 3-(bromomethyl)-5-(difluoromethyl)-2-hydroxypyridine-6-acetate
Methyl 2-(aminomethyl)-3-(difluoromethyl)-5-hydroxypyridine-4-acetate