. . "wherein R1 is a halogen atom, R2 is a lower alkyl group, R3 is hydrogen atom, Ra is hydrogen atom, Rb1 is hydrogen atom, Rb2 is hydrogen atom, Rc1 is hydrogen atom, Rc2 is hydrogen atom, Rd is hydrogen atom, Re is hydrogen atom and Rf is methyl group. (e) A compound wherein R1 is a halogen atom, R2 is cyano group, R3 is hydrogen atom, Ra is hydrogen atom, Rb1 is hydrogen atom, Rb2 is hydrogen atom" . . .