4-(Difluoromethyl)-5-fluoro-2-hydroxypyridine-3-carboxylic acid
3-(Difluoromethyl)-5-fluoro-4-hydroxypyridine-2-carboxylic acid
4-(Difluoromethyl)-6-fluoro-3-iodo-2-(trifluoromethyl)pyridine
4-(Difluoromethyl)-2-fluoro-3-iodo-5-(trifluoromethyl)pyridine