Acta Cryst. (2012). E68, o180-o181 [ doi:10.1107/S1600536811053554 ]
Abstract: In the title compound, C13H15N3O5, the O and N atoms of the nitromethyl group and the methyl C atom of the ethyl group are disordered over two sets of sites with refined occupancies of 0.629 (7):0.371 (7) and 0.533 (8):0.467 (8), respectively. The dihydropyran ring has an extremely flattened conformation. An intramolecular N-HO hydrogen bond occurs. In the crystal, pairs of N-HO hydrogen bonds link molecules, forming inversion dimers. In addition, weak intermolecular C-HO hydrogen bonds are also present.
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