SULFONAMIDE DERIVATIVE OR PHARMACEUTICALLY ACCEPTABLE ACID-ADDITION SALT

摘要

The present invention aims to provide a novel low-molecular-weight compound showing an orexin receptor agonist activity and expected to be useful as a prophylactic or therapeutic agent for narcolepsy and the like. The present invention provides a compound represented by the formula (I):; ;wherein each symbol is as described in the description, or a pharmaceutically acceptable acid addition salt thereof, which has an orexin receptor agonist activity, and an orexin receptor agonist containing the compound or a pharmaceutically acceptable acid addition salt thereof.