摘要:
The present invention provides compounds of the formula (III): or an acid addition salt thereof, wherein R 6 , R 7 , R 9 and R 10 are each hydrogen, halogen, C 1-4 alkyl or trifluoromethyl and R 8 is chlorine or R 7 and R 8 ar linked to form a -CH=CH-CH=CH- group when one of R 6 and R 10 is other than hydrogen provided that when R 8 is chlorine R 6 , R 7 , R 9 and R 10 are not all hydrogen atoms and that any one of R 6 , R 7 , R 9 and R 10 is not chlorine when the other three groups are hydrogen. Also provided are pharmaceutical compositions containing compounds of the formula (III), the first medical use of compounds of the formula (III), a process for preparing such compounds and intermediates through which this process proceeds.