| 摘要 |
Compounds of the formula I, <IMAGE> I. wherein R1, R2, R3 and R4 independently represent hydrogen, alkyl, phenyl or substituted phenyl with the proviso that two of R1, R2, R3 or R4 are phenyl or substituted phenyl and two of R1, R2, R3 or R4 are hydrogen or alkyl; m represents an integer from 1-2; and n represents an integer from 1-3; or a pharmaceutically acceptable salt thereof. The compounds are useful as pharmaceuticals, in particular, in the treatment of epilepsy.
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