| 摘要 |
New bronchospasmolytically active compounds exhibiting long duration of action and reduced undesired side effects of the structural formula <IMAGE> I and therapeutically acceptable salts thereof, in which formula R is selected from the group consisting of -C(CH3)3, <IMAGE> R1 is selected from the group consisting of H and R2, R2 represents the radical of the formula <IMAGE> wherein R3 is selected from the group consisting of (a) H (b) alkyl groups containing 1-3 carbon atoms <IMAGE> wherein R5 is selected from the group consisting of (e) OH (b) alkoxy groups containing 1-3 carbon atoms and wherein R4 is selected from the group consisting of (a) H (b) alkyl groups containing 1-3 carbon atoms, with the proviso that R3 and R4 are combined as follows: -when R3 is then is R4 -H H -alkyl group of 1-3 carbon atoms H or an alkyl group - of 1-3 carbon - atoms - -<IMAGE> H - processes for the preparation thereof, chemical intermediates at their preparation, pharmaceutical preparations containing them, and their medicinal use. |
