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. Author manuscript; available in PMC: 2010 Jul 7.
Published in final edited form as: Tetrahedron. 2007 Sep 6;63(32):7733–7742. doi: 10.1016/j.tet.2007.04.037

Figure 4.

Figure 4

Possible conformations of germacradiene sesquiterpenes such as germacrene A (1) and hedycaryol (2) fixed by the pseudo-equatorial position of the relatively large substituents (R = isopropenyl and hydroxypropyl). The conformers are denoted as UU, UD, DU and DD in reference to the U (up) and D (down) orientations of C10 and C4 methyl groups on the ten-membered ring.34, 35b