A compound of formula I wherein R1, R2, R3 and R4 can be independently selected from H or Me, n=0, 1, the dotted lines are indicating single bonds, or in case n=0 an isolated double bond at position 3′, or in case n=1 an isolated double bond at position 3′ or 4′, and the wavy bond is indicating an unspecified configuration of the adjacent double bond. Said compounds, as well as precursors capable to generate said compounds, are useful as fragrance ingredients.