2-Amino-4-(difluoromethyl)-3-(trifluoromethoxy)pyridine-6-carboxylic acid
3-Bromo-2-chloro-4-(difluoromethyl)-5-(trifluoromethoxy)pyridine
2-Amino-3-(difluoromethyl)-6-(trifluoromethoxy)pyridine-4-carboxylic acid
6-Bromo-2-chloro-4-(difluoromethyl)-3-(trifluoromethoxy)pyridine