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Ananyev I., Roitershtein D., Миняев М. et al. Acta Crystallographica Section E: Crystallographic Communications. 2018. Vol. 74. P. 1058-1062.

The title compounds, C9H12O6 and C10H14O6, 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 (P2(1)) symmetry with a single molecule in the asymmetric unit. Both crystal structures are very similar and display four -CO-OH center dot center dot center dot O=C(OH)-hydrogen bonds, forming a two-dimensional double-layered framework.

Added: Oct 4, 2019