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. 2019 Nov 20;8(12):527. doi: 10.3390/plants8120527

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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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¹H-¹H correlation spectroscopy (COSY) () and key heteronuclear multiple bond correlation (HMBC) () correlations for compounds 1 and 2.

Inline graphic — ¹H-¹H correlation spectroscopy (COSY) () and key heteronuclear multiple bond correlation (HMBC) () correlations for compounds 1 and 2.