Patent ID: 7696365

Claim:
A compound represented by the following structural formula: wherein R 1 is —COR 5 or —CONR 5 R 6 ; R3 and R4 are the same and are bromo or chloro; R 5 is C 1 -C 8 alkyl; cyclohexyl; cyclohexylmethyl; benzyl; phenethyl; naphthyl; furanylmethyl; pyridyl; methoxypyridyl; dioxolanylmethyl; benzodioxolanyl; thiazolopyrimidinonyl; methylbenzothienyl; triazolylethyl; indolyl; N-methylthiazolylamino; dimethoxyphenylcarbonylamino; a C 1 -C 3 alkyl substituted with: one substituent selected from C 1 -C 4 alkoxycarbonyl, C 1 -C 3 alkoxy, phenoxy, N,N-dimethylamino, and N,N-diethylamino, or two substituents selected from C 1 -C 3 alkyl and t-butoxycarbonyl, or one methoxy and one phenoxy, or three substituents which are two methyl and one t-butoxycarbonyl; a phenyl, benzyl or phenethyl where the phenyl ring is substituted with one substituent selected from halo, C 1 -C 6 alkyl, hydroxyl, C 1 -C 4 alkoxy, C 1 -C 4 trifluoroalkyl, trifluoromethoxy, nitro, methoxycarbonyl, ethoxycarbonylmethyl, cyanomethyl and phenylsulfonyl, or two substituents selected from halo, methoxy and benzyloxy, or one halo and one trifluoromethyl or hydroxyl, or three substituents selected from methoxy or one hydroxyl and two halo; provided that, when R 5 is phenyl substituted with one substituent, the substituent is not 4-methyl or 4-methoxy; R 6 is hydrogen; or C 1 -C 4 alkyl; or a pharmaceutically acceptable salt thereof.