| 摘要 |
The present invention provides a carbostyril compound represented by General Formula (1) or a salt thereof, wherein A is a direct bond, a lower alkylene group, or a lower alkylidene group; X is an oxygen atom or a sulfur atom; R<SUP>4 </SUP>and R<SUP>5 </SUP>each represent a hydrogen atom; the bond between the 3 and 4 positions of the carbostyril skeleton is a single bond or a double bond; R<SUP>1 </SUP>is a hydrogen atom, etc; R<SUP>2 </SUP>is a hydrogen atom, etc; and R<SUP>3 </SUP>is a hydrogen atom, etc. The carbostyril compound or salt thereof of the present invention induces the production of TFF, and thus is usable for the treatment and/or prevention of disorders such as alimentary tract diseases, oral diseases, upper respiratory tract diseases, respiratory tract diseases, eye diseases, cancers, and wounds.
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