2-Nitro-4-(trifluoromethoxy)-3-(trifluoromethyl)pyridine-5-sulfonyl chloride
4-(Difluoromethyl)-3-nitro-5-(trifluoromethoxy)pyridine-2-carboxylic acid
3-(Difluoromethyl)-5-nitro-4-(trifluoromethoxy)pyridine-2-carboxylic acid
4-(Difluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine-5-carboxylic acid