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. 2014 Oct 31;19(11):17763–17772. doi: 10.3390/molecules191117763

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© 2014 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/4.0/).

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Structures of compound 1 and 2.