| 摘要 |
The present invention relates to compounds of formula I wherein Ar1, Ar2, R, R1, R2, R3 and n are as defined herein or to pharmaceutically suitable acid addition salts, optically pure enantiomers, racemates or diastereomeric mixtures thereof. Compounds of formula I are orexin receptor antagonists and may be useful in the treatment of disorders, in which orexin pathways are involved like sleep disorders.
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