5-(Difluoromethyl)-3-methoxy-4-nitro-2-(trifluoromethoxy)pyridine
3-(Difluoromethyl)-4-methoxy-2-nitro-5-(trifluoromethoxy)pyridine
3-(Difluoromethyl)-2-methoxy-4-nitro-5-(trifluoromethoxy)pyridine
6-(Difluoromethyl)-2-methoxy-4-nitro-3-(trifluoromethoxy)pyridine