| 摘要 |
Tropolone derivatives represented by the formula (I), which have retinoid actions and are useful as active ingredients of medicaments [R<SUP>1 </SUP>to R<SUP>4 </SUP>represent hydrogen atom, an alkyl group, or an alkoxyl group; the ring represented by Ar represents an aryl ring or a heteroaryl ring; X represents a single bond, -N-N-, -CON(R<SUP>5</SUP>)-, -(C-C)<SUB>n</SUB>CON(R<SUP>6</SUP>)-, -N(R<SUP>7</SUP>)CON(R<SUP>8</SUP>)-, -SO<SUB>2</SUB>N(R<SUP>9</SUP>)-, -N(R<SUP>10</SUP>)- (R<SUP>5 </SUP>to R<SUP>9 </SUP>represent hydrogen atom or an alkyl group, n represents 1 to 3, R<SUP>10 </SUP>represents hydrogen atom, an alkyl group, or an acyl group), an alkylene group, an aryldiyl group, or a heterocyclic diyl group; Y represents hydrogen atom, -OR<SUP>11 </SUP>(R<SUP>11 </SUP>represents hydrogen atom, an alkyl group, or an acyl group), -NHR<SUP>12 </SUP>(R<SUP>12 </SUP>represents hydrogen atom, an alkyl group, an acyl group, or amino group), or a halogen atom
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