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We present additional spectroscopic evidence for the formation of low-barrier hydrogen bonds (LBHBs) within vicinal and geminal dicarboxylic acid monoanions. Hydrogencis-cyclohexane 1,2-dicarboxylate, displays low-field1H NMR signals in aprotic solvents at 19.3 to 19.7 ppm, depending on the solvent. The LBHB in hydrogen 2,2-dimethylmalonate is further characterized by the observation of a positive...