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Amide NH prelocating in the vicinity of a carboxylic acid group shifts the pKa of carboxylic acid to a lower value. A carboxylate anion is stabilized by NH⋯O hydrogen bond under hydrophobic conditions. In the case of Ca carboxylate complex, the decrease of the pKa value increases a formation constant involving the protonation process of carboxylic acid. In addition, the NH⋯O...
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