Nitrogen-containing tetracyclic compounds having anti-allergic and anti-asthmatic activities, their preparation and use
申请人:Sankyo Company Limited
公开号:EP0539164A1
公开(公告)日:1993-04-28
Compounds of formula (I):
[in which: A-B is =C=CH- or a nitrogen atom; R¹ is hydrogen, alkyl, aryl or aralkyl; and Z is alkylene] and pharmaceutically acceptable salts thereof are useful in the treatment and prevention of allergies and asthma.