| 摘要 |
Disclosed is a compound represented by the formula below, which is useful as a preventive/therapeutic agent for diseases associated with melatonin ac tivity, or a salt thereof. (In the formula, R1 represents an optionally subs tituted hydrocarbon group, an optionally substituted amino, an optionally su bstituted hydroxy or an optionally substituted heterocyclic group; R2 repres ents a hydrogen atom or an optionally substituted hydrocarbon group; R3 repr esents a hydrogen atom, a halogen atom, an optionally substituted hydrocarbo n group, an optionally substituted amino, an optionally substituted hydroxy or an optionally substituted mercapto; Xa-Xe respectively represent a carbon atom or a nitrogen atom; m represents a number of 0-2; and ring A to ring C respectively represent an optionally substituted ring.)
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