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