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