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