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. 2014 Sep 2;19(9):13643–13682. doi: 10.3390/molecules190913643

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

Variable temperature gradient ¹H-NMR spectra of hypericin in MeOH-d₃ (anionic form 4): number of scans 64, 762 and 1312 for A, B and C, respectively. The asterisk denotes an unknown compound. Reprinted with permission from [31]. Copyright 2002, by Elsevier Science Ltd. (Amsterdam, The Netherlands).