abstract |
The present invention is directed to general formula (I): As well as tautomers and pharmaceutically acceptable salts thereof wherein A 1 , A 2 , A 3 , A 4 , R 1 , R 4 , R 5 , R 6 , R 7 and R 8 are as defined herein], providing compositions comprising this compound and methods of using this compound. [Selection figure] None |