4-Chloro-3-(difluoromethyl)-6-nitropyridine-2-carboxylic acid
Methyl 2-chloro-3-cyano-5-(difluoromethyl)pyridine-6-carboxylate
5-(Difluoromethyl)-4-nitro-3-(trifluoromethyl)pyridine-2-sulfonyl chloride
6-Nitro-2-(trifluoromethoxy)pyridine-3-sulfonyl chloride