3-(Difluoromethyl)-2-hydroxy-5-methoxypyridine-4-carboxylic acid
2-(Difluoromethyl)-5-hydroxy-4-methoxypyridine-3-carboxylic acid
3-(Difluoromethyl)-6-hydroxy-2-methoxypyridine-4-acetic acid
5-(Difluoromethyl)-3-hydroxy-2-methoxypyridine-4-acetic acid