| 摘要 |
New bronchospasmolytic compounds of the formula (X) (X) and pharmaceutically acceptable salts thereof, wherein R1 and R2 are the same or different and are each H, OH, OCH3, OC2H5, halogen; or R1 and R2 together form the chain -O-CH2-O- or -O-CF2-O-; R3 is H or CH3; R5 is H or -CO-R7; R6 is H, OH, OCH3, OC2H5 or halogen; R7 is a straight or branched alkyl grup with 1-16 carbon atoms, aryl, -NHCH3 or -N(CH3)2, as well as their use and a process for their preparation.
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