2-Methyl-4-nitro-3-(trifluoromethoxy)-5-(trifluoromethyl)pyridine
3-(Difluoromethyl)-6-methyl-4-nitro-2-(trifluoromethoxy)pyridine
5-(Difluoromethyl)-2-methyl-3-nitro-4-(trifluoromethoxy)pyridine
4-(Difluoromethyl)-3-methyl-2-nitro-5-(trifluoromethoxy)pyridine