Molecular structures of N-ethylpiperidine betaine hydrate and its 1:1 complex with squaric acid

•X-ray and DFT structures of the centrosymmetric dimer of N-ethylpiperidine betaine hydrate.•Hydrogen bonds in the complex of squaric acid with N-ethylpiperidine betaine.•Preference of the carboxymethyl substituent to a hydrogen-bond formation.•2D NMR spectra determine the chemical shifts of methyle...

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