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The title molecule lies about an inversion centre at the mid-point of the N—N bond and features two intramolecular O—H
N and two C—H
O hydrogen bonds, each of which forms an S(6) ring motif. In the crystal, molecules are linked by C—H
O hydrogen bonds into infinite zigzag chains propagating along the c-axis direction. π–π stacking interactions between the pyrone rings stack the molecules along b.
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