| abstract |
A compound of the formula (I):n wherein R 1 is a hydrogen atom or lower alkyl; R 2 is a lower alkoxy, lower alkylamino, lower cycloalkyl, optionally substituted phenyl or optionally substituted heterocyclic group; R 3 is an optionally substituted phenyl; R 4 is an optionally substituted phenyl, optionally substituted cycloalkyl, optionally substituted alkyl or optionally substituted heterocyclic group, or a pharmaceutically acceptable salt thereof, which has a high affinity for gastrin receptors and/or CCK-B receptors but not for CCK-A receptors, and is useful for treating diseases associated with gastrin receptors and/or CCK-B receptors without inducing the side effects associated with CCK-A receptors. |