. "As such substituents, for example, hydroxyl group, a halogen atom such as fluorine atom, chlorine atom, bromine atom, and iodine atom; a C1-C6 alkyl group such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group; C1-C6 halogenated alkyl group such as trifluoromethyl group; a C1-C6 alkoxyl group such as methoxy group, ethoxy group, n-propo" . . .