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. 2018 Nov 16;23(11):2996. doi: 10.3390/molecules23112996

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© 2018 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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Structures of 1,4-dioxane (STD), ethylene glycol dimethacrylate (EGDMA), methacrylic acid (MAA), theophylline (THP) and caffeine (CAF). Labelled atoms correspond to nuclei used for NMR analysis.