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. 2019 Nov 21;17(12):652. doi: 10.3390/md17120652

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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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Electronic circular dichroism (ECD) spectra showing experimental and calculated analysis of isomers 1–4. (A) Calculated ECD spectra for isomer 1 was consistent with the experimental ECD spectra for compound 1. (B) Calculated ECD spectra for isomer 2 was consistent with the experimental ECD spectra for compound 1. (C) Calculated ECD spectra for isomer 1’ was consistent with the experimental ECD spectra for compound 2. (D) Calculated ECD spectra for isomer 2’ was consistent with the experimental ECD spectra for compound 2.