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Two polymorphs of N-(2-meth­oxy­phen­yl)-4-oxo-4H-chromone-3-car­box­amide crystallise in the monoclinic space group P21/c, each with two molecules in the asymmetric unit. The conformations of all four molecules are similar, the main differences being in their supramolecular interactions.

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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.
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