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. 2011 Dec 23;17(1):98–144. doi: 10.3390/molecules17010098

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© 2012 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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Chemical structure of compounds 44–48.