5-(Difluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine-3-acetic acid
2-(Bromomethyl)-3-(trifluoromethoxy)-4-(trifluoromethyl)pyridine-6-carboxylic acid
4-(Difluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine-3-acetic acid
3-(Difluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine-6-acetic acid