| abstract |
There are disclosed compounds of the formula ##STR1## n is 0-6; A is O or S; n B is OR 2 , SR 2 or N(R 2 ) 2 ; n R 1 is hydrogen, loweralkyl, loweralkoxy or halo; n R 2 is hydrogen or loweralkyl; n and the pharmaceutically acceptable salts thereof, and their use in the treatment of leukotriene-mediated naso-bronchial obstructive airpassageway conditions, such as allergic rhinitis, allergic bronchial asthma and the like. |