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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 (https://creativecommons.org/licenses/by/4.0/).
Top: Putative binding modes of receptor 1 for the dihydrogen phosphate anion. Bottom: Partial 1H NMR spectra measured during the titration of receptor 1 (3 mM) with tetrabutylammonium dihydrogen phosphate (TBAH2PO4) in CD3CN.