Ethyl 4-(difluoromethyl)-2-methoxy-6-(trifluoromethoxy)pyridine-3-carboxylate
4-(Difluoromethyl)-2-methoxy-3-(trifluoromethoxy)pyridine-5-carboxylic acid
Ethyl 3-(difluoromethyl)-5-methoxy-6-(trifluoromethoxy)pyridine-2-carboxylate
5-(Difluoromethyl)-3-methoxy-4-(trifluoromethoxy)pyridine-2-carboxylic acid