The present invention relates to the use of the compounds of general formula 1 wherein the groups R<;SUP>;1<;/SUP>;, R<;SUP>;2 <;/SUP>;and R<;SUP>;3 <;/SUP>;may have the meanings specified in the claims and in the description, for preparing a pharmaceutical composition for the treatment of respiratory complaints, as well as new compounds of formula 1, processes for preparing them, and pharmaceutical formulations containing them.