abstract |
(-) or (+) Isomer compounds of formula (I) and pharmacological salt, in which R1 represents H or halo, R2 represents CF3, CN or halo, R3 represents C1-6 linear or branched alkyl, C3-6 cycloalkyl. A process for preparing said compounds and compositions thereof. The present compounds have beta-2 receptor stimulant action and can be used for treating asthma or bronchitis. |