| 摘要 |
An object of the present invention is to research a therapeutic agent for a keratoconjunctival disorder. A compound represented by the following general formula (1) or a salt thereof exhibits an excellent improving effect on corneal disorder models, and therefore is useful as a therapeutic agent for a keratoconjunctival disorder such as dry eyes, corneal ulcer, keratitis or conjunctivitis. In the formula, the ring Y represents a substituted or unsubstituted nitrogen-containing heterocyclic ring; R1 represents a carboxy group or a substituted or unsubstituted nitrogen-containing 5-membered heterocyclic ring; and R2 and R3 may be the same or different and represent a hydrogen atom, a substituted or unsubstituted alkyl group or a substituted or unsubstituted alkylcarbonyl group. In the formula, X represents
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