2-(Chloromethyl)-5-(difluoromethyl)-4-methylpyridine-3-carboxylic acid
2-(Chloromethyl)-5-(difluoromethyl)-3-methylpyridine-6-carboxylic acid
2-(Chloromethyl)-5-(difluoromethyl)-3-methylpyridine-4-carboxylic acid
6-(Chloromethyl)-4-(difluoromethyl)-2-methylpyridine-3-carboxylic acid