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