. "om, halogen atom other than fluorine atom, or alkyl group having 1-10 carbon atoms, provided that at least one of seven R10 groups and 2i R11 groups represents a fluorine atom or fluoroalkyl group having 1-10 carbon atoms, and i is an integer of 0 to 10. [0194] wherein R10 individually represents a fluorine atom, fluoroalkyl group having 1-10 carbon atoms, hydrogen atom, halogen atom other than fl" . . . .