A compound represented by the following general formula (I):
[wherein R
1
and R
2
represent an alkyl group, X represents —S—, —O— or —NH—, Y represents C or N, R
3
represents hydrogen atom or a C
1-10
alkyl group, Z represents —CO—N(R
5
)— (R
5
represents hydrogen atom or a C
1-6
alkyl group) or —C(R
6
)═C(R
7
)—CO—NH— (R
6
and R
7
represent hydrogen atom or a C
1-6
alkyl group), Ar represents an aryldiyl group or a heteroaryldiyl group, and R
4
represents —COOH, —OCH
2
—COOH, —CH
2
—COOH, or —CH
2
—CH
2
—COOH], which has a retinoid action and is useful as an active ingredient of a medicament.