ARYL-SUBSTITUTED NITROGEN-CONTAINING HETEROCYCLIC COMPOUND

摘要

Disclosed is an aryl-substituted nitrogen-containing heterocyclic compound represented by the formula (I) below or a pharmaceutically acceptable salt thereof. This compound serves as a nociceptin receptor antagonist and is useful as a pharmaceutical agent for treating diseases associated with a nociceptin receptor. (I) [In the formula, A₁, A₂ and A₃ independently represent a carbon atom or a nitrogen atom, and one or two of A₁, A₂ and A₃ represent a carbon atom; R¹ represents a lower alkyl group or the like; R² represents a phenyl group which may be substituted by a halogen atom or the like; R³ represents a hydrogen atom, a lower alkyl group or the like; and R⁴ represents a lower alkyl group or the like.]