Methyl 2-(chloromethyl)-3-(difluoromethyl)-5-hydroxypyridine-6-acetate
5-(Chloromethyl)-3-(difluoromethyl)-4-hydroxypyridine-2-acetic acid
6-(Difluoromethyl)-3-iodo-4-methylpyridine-2-acetic acid
6-(Difluoromethyl)-4-iodo-3-methylpyridine-2-acetic acid