The compound represented by the following formula (1): ##STR00001## wherein A, B, R1, R2, R3 and Z are as defined in the specification is analogous to shogaol and gingerol useful in the fields of foods, medicines, quasi-drugs, cosmetics, etc., and more highly active in tyrosinase activity inhibition, etc. than shogaol and gingerol.

 
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< Foam-generating kit containing a foam-generating dispenser and a composition containing a high level of surfactant

> Rose plant named `Bokraskate`

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