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. 2019 May 9;24(9):1794. doi: 10.3390/molecules24091794

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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-NMR spectra (HMPT-d18, 298K) of parent black alder soda lignin and its fraction, extracted by CH₂Cl₂. Solvent contaminants peaks are marked by asterisk.