The present invention provides a compound represented by the formula
wherein R1 is a hydrocarbon group optionally having substituent(s), amino optionally having substituent(s), hydroxy optionally having a substituent or a heterocyclic group optionally having substituent(s), R2 is a hydrogen atom or a hydrocarbon group optionally having substituent(s), R3 is a hydrogen atom, a halogen atom, a hydrocarbon group optionally having substituent(s), amino optionally having substituent(s), hydroxy optionally having a substituent or mercapto optionally having a substituent, Xa, Xb, Xc and Xd are each a carbon atom or a nitrogen atom, provided that any one or two of Xa, Xb, Xc and Xd is/are nitrogen atom(s), m is 0 to 2, and rings A to C are each a ring optionally having substituent(s), or a salt thereof, which is useful as an agent for the prophylaxis or treatment of a disease relating to an action of melatonin, and the like.
本发明提供了一种由式表示的化合物
其中 R1 是任选具有取代基的烃基、任选具有取代基的
氨基、任选具有取代基的羟基或任选具有取代基的杂环基;R2 是氢原子或任选具有取代基的烃基;R3 是氢原子、卤素原子、任选具有取代基的烃基、任选具有取代基的
氨基、Xa、Xb、Xc 和 Xd 各为碳原子或氮原子,条件是 Xa、Xb、Xc 和 Xd 中的任意一个或两个为氮原子,m 为 0 至 2,环 A 至 C 各为可选具有取代基的环,或其盐,可用作预防或治疗与
褪黑素作用有关的疾病的制剂等。