The present invention relates to a compound of the formula STR1 and the pharmaceutically acceptable salts thereof wherein W is a tricyclic heterocyclic ring system; which is an α-1 adrenergic antagonist and is useful in the treatment of BPH; also disclosed are . alpha.-1 antagonist compositions and a method for antagonizing α-1 receptors and treating BPH.
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(2008/06/13)
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