| abstract |
or a tautomer or prodrug thereof, or a pharmaceutically acceptable salt of said compound, tautomer or prodrug, wherein: R1, R2, R3, R4 and R5 are each independently selected from H, halogen, CN, CF3 and CONH2. 2. A compound according to claim 1, wherein R1, R2, R3, R4 and R5 are each independently selected from H, F, CI, Br, CN and CF3. 3. A compound according to claim 1 or claim 2, wherein at least one of R1, R2, R3, R4 and R5 is CN and at least two of R1, R2, R3, R4 and R5 are H 4. A compound according to any preceding claim, wherein R1 and R4 are H, one of R2 and R3 is H and the other is CN, and is selected from F, CI, Br and CF3. 5. A compound according to any preceding claim, wherein it is CN and R5 is CF3. |