"n aromatic ring or aromatic heterocyclic ring in a case where R20 represents a group other than the aryl group, R8 and R12 each independently represent a substituent capable of substituting the benzene ring, m1 represents an integer of 0 to 3, m2 represents an integer of 0 to 4 and Lv3, Lv4 and Lv5 each independently represent a leaving group." . . . .