| 摘要 |
Compounds of the formula <IMAGE> (I) wherein each R is hydrogen or one R is hydrogen and the other is lower alkyl, R1 is hydrogen, lower alkyl, aryl, aralkyl or lower carboalkoxy, R2 is hydrogen or lower alkyl, and the ring A is unsubstituted or substituted by lower alkyl, lower alkoxy, halo or trifluoromethyl, and pharmaceutically acceptable salts thereof, their preparation, pharmaceutical compositions and the uses thereof, such as alpha 2-adrenergic blocking agents, e.g. antidepressants, cognition enhancers and appetite supressants, and as intraocular pressure reducing agents are disclosed.
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