. "Preferred examples of the substituent which may be possessed by the substituents described above include a hydroxy group, a halogen atom (fluorine, chlorine, bromine, and iodine), a nitro group, a cyano group, an amido group, a sulfonamido group, an alkyl group such as the alkyl group described with regard to Ra to Rg hereinbefore, an alkoxy group such as methoxy, ethoxy, hydroxyethoxy, propoxy, h" . . .