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