| 摘要 |
The present invention is directed to compounds of formula (I), and the pharmaceutically acceptable acid addition salts thereof, wherein R is selectetd from the group consisting of F, -CF3, -OCH3, -O(C1)alkyl substituted with 1 to 3 fluoro atoms, -O(C2)alkyl substituted with 1 to 5 fluoro atoms, and -O(C3)alkyl substituted with 1 to 7 fluoro atoms. The compounds of formula (I) are useful in the treatment of stroke, traumatic brain injury and central nervous system degenerative diseases.
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