Patent ID: 6924292

Claim:
A compound of the Formula: wherein R 1 is a hydrogen atom, optionally substituted hydrocarbon group, optionally substituted heterocyclic group or optionally substituted amino group, each of R 2 and R 3 is a hydrogen atom, optionally substituted hydrocarbon group or acyl group, and R 2 and R 3 may be taken together with the adjacent carbon atom to form an optionally substituted 3- to 8-membered ring, R 4 is a hydrogen atom, cyano group, optionally substituted hydrocarbon group, acyl group or optionally substituted hydroxy group, R 5 is (1) a hydrogen atom, (2) an optionally substituted hydrocarbon group, (3) an acyl group, (4) an optionally substituted heterocyclic group or (5) a halogen atom, each of R 6 and R 7 is a hydrogen atom or optionally substituted hydrocarbon group, and R 6 and R 7 may be taken together with the adjacent carbon atom to form an optionally substituted 3- to 8-membered ring, each of R 8 and R 9 is a hydrogen atom or optionally substituted hydrocarbon group, X is a bond, oxygen atom, optionally oxidized sulfur atom or optionally substituted nitrogen atom, Y is an optionally substituted methylene group or carbonyl group, and n is 0 to 1): or a salt or a prodrug thereof.