abstract |
The present invention provides a compound represented by the general formula (I) having a configuration of (−) or (+), or a pharmaceutically acceptable salt thereof. [Chemical 1] (Wherein R 1 is H or a halogen atom, R 2 is CF 3 , CN or a halogen atom, R 3 is a C 1-6 linear or branched alkyl group, or C 3- 6 cyclic alkyl groups.) The present invention also relates to a method for producing the compound and a composition containing the compound. The compounds of the present invention have β 2 -receptor excitability and are used for the treatment of asthma or bronchitis. |