A compound represented by the following general formula (I):[wherein R1 represents hydrogen atom or a C1-6 alkyl group, A and B represent —(CH2)2—, —(CH2)3— or —(CH2)4—, X represents —N(R2)— (R2 represents hydrogen atom or a C1-6 alkyl group), —CO—, —C(═N—R3)— (R3 represents hydrogen atom or a C1-6 alkyl group), or —C(═C(R4)(R5))— (R4 and R5 independently represent hydrogen atom or a C1-6 alkyl group), and Ar represents an aryldiyl group or a heteroaryldiyl group], which has an action of controlling physiological activities of retinoids and useful as an active ingredient of a medicament.
