. . . . . . . "The substituent, which the phenyl group optionally has, for example, a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom, an iodine atom; an alkoxy group such as a methoxy group, an ethoxy group, a tert-butoxy group; an aryloxy group such as a phenoxy group, a p-tolyloxy group; an alkylthioxy group such as a methylthioxy group, an ethylthioxy group, a tert-butylthioxy group; an" . .