| abstract |
The invention relates to the novel beta agonists of formula (I), wherein R1 to R4 are defined as in the claims and the description. The invention also relates to the tautomers, racemates, enantiomers, diastereomers, solvates, hydrates, or mixtures thereof, to their prodrugs and their salts, especially their physiologically acceptable salts with inorganic or organic acids or bases, to a method for producing said compounds and to their use as drugs. |