om such as fluorine atom, chlorine atom or bromine atom, nitro group, C1???C4 perhalogenated alkyl group (trifluoromethyl), C1???C4 perhalogenated alkoxy group (trifluoromethoxy), C2???C5 perhalogenated alkylcarbonyl group (trifluoroacetyl), C1???C4 perhalogenated alkylenedioxy group (difluoromethylenedioxy), C2???C5 perhalogenated alkenyl group (perhalogenated vinyl), perhalogenated phenoxy group