EP1340748B1 — Quinazoline derivatives and drugs

USPTO Abstract

The invention provides an excellent novel analgesic which acts on a nociceptin receptor to exhibit a wide range of the analgesic effect for example on a chronic pain as well as an allodynia accompanied with a herpes zoster. The invention relates to a nociceptin receptor agonist comprising as an active ingredient a compound represented by Formula (I) or a salt thereof: <CHEM> wherein R<1> represents a hydrogen atom or alkyl; A<1> and A<2> are the same or different and each represents a single bond or a divalent aliphatic hydrocarbon group; Q represents a single bond, cycloalkylene group, phenylene group or a divalent heterocyclic group; R<2A> and R<2B> are the same or different and each represents a hydrogen atom or alkyl; R<3> represents an optionally substituted phenyl group or heterocyclic group; R<4> and R<5> are the same or different and each represents a hydrogen atom, alkyl, alkoxy, aralkyloxy, halogen, nitro, hydroxy, alkoxycarbonyl, -NR<6>R<7> and the like.