4-Amino-5-(difluoromethyl)-2-methoxypyridine-3-carboxylic acid
4-(Chloromethyl)-2-cyano-3-(difluoromethyl)pyridine-6-acetic acid
4,5-Dihydroxy-3-(trifluoromethoxy)pyridine-2-sulfonyl chloride
2-Hydroxy-5-(trifluoromethoxy)pyridine-4-sulfonyl chloride