Acta Cryst. (2003). E59, o728-o730  [ doi:10.1107/S1600536803007657 ]

Tetrahydro-2,6,6-trimethyl-1,4-pyran-2,5-dicarboxylic acid (cineolic acid)

J. C. Barnes and T. J. R. Weakley

Abstract: In the title compound, C₁₀H₁₆O₅, the carboxylate group at the C-2 position is axial, but that at C-5 is equatorial. These carboxylate groups form hydrogen-bonded rings [average OO' distance = 2.64  (1)  Å] across the inversion centers at (½, 0, 0) and (½, ½, ½), respectively, linking the molecules into stepped chains along the bc diagonal of the cell.

Online 30 April 2003

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