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. 2015 Jun 12;20(6):10884–10909. doi: 10.3390/molecules200610884

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© 2015 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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	R₁	R₂
α	CH₃	CH₃
β	CH₃	H
γ	H	CH₃
δ	H	H