3-Amino-4-methoxy-2-(trifluoromethoxy)pyridine-6-sulfonyl chloride
6-Bromo-4-(difluoromethyl)-3-nitropyridine-2-carboxylic acid
6-Chloro-4-cyano-3-(difluoromethyl)pyridine-2-sulfonyl chloride
2-Amino-4-hydroxy-5-(trifluoromethoxy)pyridine-3-carboxylic acid