The present invention relates to the perfume or flavor industry. It concerns more particularly an acetal of formula (I), in which the symbols R1 represent, independently or simultaneously, a linear or branched saturated or unsaturated C¿1? to C4 hydrocarbon group; or the two R?1¿ are bonded together to form a saturated ring having 5 to 7 atoms and including the oxygen atoms to which said R1 groups are bonded, this ring being possibly substituted by methyl or ethyl groups; and the wavy line indicates that the double bond in position 4 has a configuration of the type (Z) or (E) or a mixture of the two configurations. The invention relates also to the use of such a compound as a perfuming or flavoring ingredient, as well as the perfumed or flavored articles or perfuming or flavoring compositions containing a compound according to the invention.