3,5-Dimethoxy-4-(trifluoromethoxy)pyridine-2-carbonyl chloride
3,5-Dimethoxy-2-(trifluoromethoxy)pyridine-4-carbonyl chloride
3,4-Dimethoxy-6-(trifluoromethoxy)pyridine-2-carbonyl chloride
4,5-Dimethoxy-3-(trifluoromethoxy)pyridine-2-carbonyl chloride