Methyl 5-nitro-2-(trifluoromethoxy)pyridine-4-carboxylate
3-(Difluoromethyl)-4-methyl-2-(trifluoromethoxy)pyridine-6-acetic acid
Methyl 4-nitro-3-(trifluoromethoxy)pyridine-5-carboxylate
3-(Difluoromethyl)-2-methyl-6-(trifluoromethoxy)pyridine-4-acetic acid