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. 2011 Nov 18;16(11):9611–9619. doi: 10.3390/molecules16119611

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© 2011 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/).

PMC Copyright notice

Chemical structures of the evaluated compounds. 1: sclareol, 2: manool, CA: (−)-copalic acid (CA), 4: (−)-acetoxycopalic acid, 5: (−)-hydroxycopalic acid, 6: (−)-agathic acid.