| 摘要 |
The invention provides compounds of formula (I) wherein R1, R2, R3, R4, R5, R6 and L are as defined in the specification and optical isomers, racemates and tautomers thereof, and pharmaceutically acceptable salts thereof; together with processes for their preparation, pharmaceutical compositions containing them and their use in therapy. The compounds are useful in the treatment of hepatitis C virus.
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