Patent ID: 7141598

Claim:
A compound of the formula: wherein n is 1 and Ar is a group of the formula: wherein m1 is an integer of 1 to 4, m2 is an integer of 0 to 3, R 1 and R 2 are the same or different and each is independently a hydrogen atom, an optionally substituted hydroxyl group, an optionally substituted thiol group, an optionally substituted amino group, an acyl group, a halogen atom or an optionally substituted hydrocarbon group, a group of the formula: wherein m3 is an integer of 1 to 5, m4 is an integer of 0 to 4, R 3 and R 4 are the same or different and each is independently a hydrogen atom, an optionally substituted hydroxyl group, an optionally substituted thiol group, an optionally substituted amino group, an acyl group, a halogen atom or an optionally substituted hydrocarbon group, or a group of the formula: wherein m5 is an integer of 1 to 4 and R 5 is hydrogen atom, an optionally substituted hydroxyl group, an optionally substituted thiol group, an optionally substituted amino group, an acyl group, a halogen atom or an optionally substituted hydrocarbon group, or a salt thereof or a prodrug thereof.