Acta Cryst. (2013). C69, 1081-1084 [ doi:10.1107/S0108270113020908 ]
Abstract: The organic component of the title compound, C22H20N2O5·2H2O, exhibits approximate but noncrystallographic mirror symmetry. The molecules of the organic component are linked by a combination of one O-HO hydrogen bond and two N-HO hydrogen bonds to form sheets containing R22(8), R22(16) and R66(40) rings. These sheets are linked into a continuous three-dimensional framework structure by cyclic centrosymmetric R42(8) water tetramers. Comparisons are made with some simpler analogues.
Keywords: crystal structure; hydrogen bonding; cyclic water tetramers.
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