| abstract |
Compounds of formula (I):n [in which: A is a group of formula (II) or (III):n R¹, R² and R³ are hydrogen, lower alkyl or halogen; R⁴ is hydrogen, lower alkyl or aralkyl; R⁵ and R⁶ are hydrogen or lower alkyl; R⁷ and R⁸ are hydrogen or lower alkyl; or R⁷ and R⁸ together represent alkylene; and m is 1 or 2;] and n pharmaceutically acceptable salts thereof are useful in the treatment of cardiovascular disorders. |