4-(Bromomethyl)-6-(difluoromethyl)-2-methoxypyridine-3-carboxylic acid
3-(Bromomethyl)-2-(difluoromethyl)-5-methoxypyridine-4-carboxylic acid
5-(Bromomethyl)-3-(difluoromethyl)-2-methoxypyridine-4-acetic acid
3-(Bromomethyl)-4-(difluoromethyl)-2-methoxypyridine-5-acetic acid