3-(Difluoromethyl)-2-methoxy-4-(trifluoromethoxy)pyridine-6-carboxylic acid
Methyl 5-(difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine-3-acetate
Methyl 3-(difluoromethyl)-4-nitro-5-(trifluoromethoxy)pyridine-2-acetate
Methyl 3-(difluoromethyl)-2-nitro-6-(trifluoromethoxy)pyridine-5-acetate