Germacrene D is a major volatile component of Bursera species and a precursor in sesquiterpene biosynthesis in a variety of plants, including Solidago species.[1],[2]
Reference:
[1]. Noge, K., and Becerra, J.X. Germacrene D, a common sesquiterpene in the genus Bursera (Burseraceae). Molecules 14(12), 5289-5297 (2009).
[2]. Bülow, N., and König, W.A. The role of germacrene D as a precursor in sesquiterpene biosynthesis: Investigations of acid catalyzed, photochemically and thermally induced rearrangements. Phytochemistry 55(2), 141-168 (2000).