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