Patent ID: 6930104

Claim:
A compound of the following Formula (I) or a salt or prodrug thereof: wherein R 1 and R 2 , which may be the same or different, each represent a hydrogen atom, an optionally substituted lower alkyl group or an optionally substituted hydroxy group, or R 1 and R 2 may together form a 4- to 7-membered ring together with their adjacent carbon atoms, Ar 1 represents an optionally substituted aromatic group, the ring A represents an optionally substituted benzene ring, the ring B represents an optionally substituted aromatic ring, the ring C represents an optionally substituted 4- to 8-membered ring which may further be condensed with an optionally substituted ring, X represents CH or N, and represents a single bond or a double bond, provided that Y represents CH or N when said bond is a single bond, and Y represents C when said bond is a double bond.