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. 2019 Jun 6;9(6):107. doi: 10.3390/metabo9060107

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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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HSQC NMR spectra of vitamins D₂ (9), D₃ (13), D₄ (10), D₅ (6), D₆ (8), and D₇ (7). Methine (CH)/methyl (CH₃) resonances have a positive intensity and are plotted in black; methylene (CH₂) resonances have a negative intensity and are plotted in red.