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