Patent ID: 8163935

Claim:
A compound represented by formula (I): wherein R 1 is an acyclic branched C 3-7 alkyl optionally substituted with hydroxyl; a phenyl optionally substituted with a halogen, nitro, hydroxyl, C 1-6 alkoxy, amino, methyl, methylaminomethyl, ethyl or propyl; or a N-linked pyrrolyl or pyrazolyl each of which may be substituted with 1 to 3 substituents selected from the group consisting of C 1-6 alkyl and C 6-10 aryl; R 2 is a phenyl which may be substituted with acetyl, propionyl, dimethylaminocarbonyl, methylaminocarbonyl, dimethylamino, methylamino, amino, halogen, methyl, ethyl, trifluoromethyl, methoxy, ethoxy or trifluoromethoxy; X is —NR 3 — (wherein R 3 is a C 1-8 alkyl optionally substituted with hydroxyl); Y 1 is CR 3a , wherein R 3a is a hydrogen, a halogen, a cyano, a C 1-3 alkyl optionally substituted with hydroxyl, or a C 1-3 alkoxy optionally substituted with halogen; Y 2 is CR 3b , wherein R 3b is a hydrogen; Y 3 is CR 3c , wherein R 3c is a hydrogen; and Z is an oxygen or —NR 4 —, wherein R 4 is a hydrogen; or a salt thereof.