the present invention is directed to novel fragrance compounds and their unexpected advantageous use in enhancing , improving or modifying a fragrance formulation through the addition of an olfactory acceptable amount of the compounds , wherein the compounds are represented by the following formula : wherein the dotted line represents a single or double bond ; r is selected from the group consisting of propyl , butyl , and pentyl ; and r 1 and r 2 together represent ═ o or a ring structure represented by