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