4-Chloro-2-(difluoromethyl)-3-methylpyridine-5-carboxylic acid
5-Chloro-3-(chloromethyl)-4-(difluoromethyl)pyridine-2-carboxylic acid
3-Chloro-5-(difluoromethyl)-2-methylpyridine-4-carboxylic acid
2-Chloro-5-(chloromethyl)-3-(difluoromethyl)pyridine-4-carboxylic acid