. . . . . "The substituent may include a carbonyl group, a thiocarbonyl group, halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom, a hydroxyl group, a mercapto group, an oxime group, an imino group, an isocyanato group (isocyanate group), a thioisocyanato group (thioisocyanate group), a cyano group, primary to tertiary amino groups, a nitro group, a carboxyl group, chai" . .