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. 2017 May 11;22(5):781. doi: 10.3390/molecules22050781

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© 2017 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Chemical structures of 12-acetoxy,16-epi-hyrtiolide (60), 12β-acetoxy,16β-methoxy,20α-hydroxy-17-scalaren-19,20-olide (61) and the sesterterpenes 62–66.