Potassium tri-hydrogen di-malonate is an acid salt of Type B2, and has three very short, but unsymmetrical hydrogen bonds; two of these, with O ⋯ O = 2·543(8) and 2·554(7)Å respectively, are intermolecular, whilst the third, with O ⋯ O = 2·513(9)Å, is intramolecular, and completes a planar six-membered ring.
M. Currie, J. Chem. Soc., Chem. Commun., 1972, 972b DOI: 10.1039/C3972000972B
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