Acta Cryst. (2013). C69, 1527-1533 [ doi:10.1107/S0108270113029727 ]
Synopsis: The structures of 4-oxo-N-phenyl-4H-chromene-2-carboxamide and of a new polymorph of 7-methoxy-4-oxo-N-p-tolyl-4H-chromene-2-carboxamide and its hemihydrate. The structures have an anti-rotamer conformation about the C-N bond; however, the amide O atom can be either trans- or cis-related to the O atom of the pyran ring.
Formula: C16H11NO3, C18H15NO4·0.5H2O and C18H15NO4
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