Description:
<jats:p>The title compounds, C<jats:sub>9</jats:sub>H<jats:sub>12</jats:sub>O<jats:sub>6</jats:sub> and C<jats:sub>10</jats:sub>H<jats:sub>14</jats:sub>O<jats:sub>6</jats:sub>, were formed by careful hydrolysis of the corresponding diethyl esters. Their single crystals were grown from an ethyl acetate/hexane mixture. Crystals of both compounds have monoclinic (<jats:italic>P</jats:italic>2<jats:sub>1</jats:sub>) symmetry with a single molecule in the asymmetric unit. Both crystal structures are very similar and display four –CO—OH...O=C(OH)– hydrogen bonds, forming a two-dimensional double-layered framework.</jats:p>