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. 2010 Oct 28;15(11):7603–7698. doi: 10.3390/molecules15117603

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© 2010 by the authors;

licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Minor products from the cyclization of FPP (378) by ADS, which have not yet been reported as natural products from A. annua. Amorph-4-en-11-ol (574) is probably formed by quenching of the C-11 amorphane cation by water; β-sesquiphellandrene (575) by elimination of H-15 from the C-1 bisabolyl cation; zingiberene (576) from elimination of H-4 from the C-1 biasabolyl cation; zingiberenol (577) by quenching of the allylic C-1 bisabolyl cation by water; and γ-humulene (578) by an alternative cyclization of nerolidyl pyrophosphate.