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. 2019 Jan 19;24(2):350. doi: 10.3390/molecules24020350

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© 2019 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 natural sesquiterpene lactones (SLs) arglabin (1), argolide (2), dihydroargolide (2c), grosheimin (3), 3β-hydroxyarhalin (4), and their semi-synthetic derivatives 1a–f, 2a, b, 3a, b, 4a.

Chemical structures of natural sesquiterpene lactones (SLs) arglabin (1), argolide (2), dihydroargolide (2c), grosheimin (3), 3β-hydroxyarhalin (4), and their semi-synthetic derivatives 1a–f, 2a, b, 3a, b, 4a.