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. 2019 May 15;24(10):1875. doi: 10.3390/molecules24101875

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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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The crystalline structure of: (a) trans,trans- $γ$ -chloro- $δ$ -lactone 5a; and (b) trans,trans- $γ$ -bromo- $δ$ -lactone 7a.