5-(Difluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine-4-carboxylic acid
4-(Difluoromethyl)-6-nitro-2-(trifluoromethoxy)pyridine-3-carboxylic acid
4-(Difluoromethyl)-5-nitro-3-(trifluoromethoxy)pyridine-2-carboxylic acid
3-(Bromomethyl)-2-(difluoromethyl)-6-(trifluoromethoxy)pyridine-4-carboxaldehyde