Patent ID: 7144843

Claim:
A compound of formula (1) or a salt thereof: wherein R 1 , which may be the same or different, represent(s) a halogen atom; straight chain, branched chain, or cyclic C1–6 alkyl optionally substituted by a halogen atom or hydroxyl; straight chain or branched chain C1–6 alkoxy optionally substituted by a halogen atom or hydroxyl; or nitro, n is an integer of 0 (zero) to 3, R 2 represents a hydrogen atom; a halogen atom; or straight chain, branched chain, or cyclic C1–4 alkyl optionally substituted by a halogen atom or hydroxyl, and R 3 represents a hydrogen atom; a halogen atom; or straight chain, branched chain, or cyclic C1–12 alkyl optionally substituted by a halogen atom or hydroxyl, or R 2 and R 3 together may represent —(CH 2 ) m — wherein m is an integer of 3 or 4; excluding the compound of formula (1) wherein n is 0, R 2 represents a hydrogen atom, and R 3 represents methyl.