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(A–C) Adjusted retention time (t’R) of KR12-NH2 analogs with aliphatic carboxylic acid residues ((A) I–XIV; (B)—The analogs (I, II, III, IX, X, XIII, and XIV); (C) The analogs XV–XXI) vs. the number of carbon atoms in carboxylic acid residue. (D) Bond order of aromatic carboxylic acids and amides vs. LogP; (E) bond order in aromatic carboxylic acid residues in KR12-NH2 analogs vs. t’R.
