| abstract |
A compound of formula 1 n n nwherein: R 1 is C 1 -C 4 -alkyl; R 2 is C 1 -C 4 -alkyl; and R 3 is C 1 -C 4 -alkyl or phenyl, each optionally mono- or polysubstituted, or R 2 and R 3 together are —CH 2 —CH 2 — or —CH 2 —CH 2 —CH 2 —, or the corresponding acid addition salt with a pharmacologically acceptable acid, processes for preparing such compounds, pharmaceutical compositions containing such compounds, and their use in the treatment of inflammatory and obstructive respiratory diseases. |