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. 2020 Dec 17;25(24):5975. doi: 10.3390/molecules25245975

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© 2020 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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Molecular structures of the ionic liquids (ILs) employed, including: (a) allylbenzyldimethylammonium acetate (AlBzMe₂NAcO); (b) 1-(2-methoxyethyl)-3-methylimidazolium acetate (C₃OMeImAcO); (c) 1,8-diazabicyclo[5.4.0]undec-7-ene-8-ium acetate (DBUHAcO); (d) tetramethylguanidinium acetate (TMGHAcO).