Patent ID: 8373007

Claim:
A compound represented by the formula (I): wherein R 1 represents a hydrogen atom, a halogen atom, a nitro group, a nitroso group, a cyano group, an optionally substituted hydrocarbon group, an optionally substituted heterocyclic group, an optionally substituted hydroxy group, an optionally substituted amino group, an optionally substituted mercapto group, an optionally substituted acyl group, an optionally substituted carbamoyl group, or an optionally substituted sulfonyl group; R 2 and R 3 are the same or different and each represents a lower alkyl group, or R 2 and R 3 may combine together to form a ring; R 4 and R 5 are the same or different and each represents a lower alkyl group, or R 4 and R 5 may combine together to form a ring; X and Y are the same or different and each represents a bromine atom or a chlorine atom; n represents a number of 2 or more; and m represents 0 to n.