摘要 |
<p>Compounds of the formula <IMAGE> or physiologically acceptable salts thereof in which formula R1 is methyl, ethyl or n-propyl, R2 is methyl or n-propyl and R3 is <IMAGE> methods for the preparation thereof; intermediates useful for their preparation; pharmaceutical preparations containing at least one of these compounds; and the use thereof in the treatment of allergy and bronchial asthma.</p> |