| abstract |
New bronchospasmolytically active compounds exhibiting long duration of action and reduced undesired side effects of the structural formulan and therapeutically acceptable salts thereof, in which formula R is selected from the group consisting of -C(CH 3 ) 3 ,n andn R 1 is selected from the group consisting of H and R2 , R 2 represents the radical of the formulan wherein R 3 is selected from the group consisting ofn (a) H (b) alkyl groups containing 1-3 carbon atomsn wherein R 5 is selected from the group consisting of (a) OH (b) alkoxy groups containing 1-3 carbon atoms and wherein R 4 is selected from the group consisting of (a) H (b) alkyl groups containing 1-3 carbon atoms, with the proviso that R 3 and R 4 are combined as follows: processes for the preparation thereof, chemical intermediates at their preparation, pharmaceutical preparations containing them, and their medicinal use. |