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