| abstract |
Compounds are disclosed of formula (I)n wherein nR₁ represents C₁₋₆ alkyl; nR₂ represents H or C₁₋₆ alkyl; nR₃ represents H or C₁₋₃ alkyl; nand pharmaceutically acceptable salts and solvates (for example hydrates) thereof. n The compounds are indicated as useful for the treatment of migraine, cluster headache, chronic paroxysmal hemicrania and headache associated with vascular disorders. n Processes and intermediates for their preparation and pharmaceutical compositions containing them are also disclosed. |