N-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)acetamide–naphthalene-2,3-diol (1/1)

In the reaction of naphthalene-2,3-diol and 4-amino­anti­pyrine in the presence of acetic acid, the amine function is acetyl­ated and the resulting acetamide co-crystallizes with the diol in the title compound, C(13)H(15)N(3)O(2)·C(10)H(8)O(2), with 1:1 molar stoichiometry. The two components are linked by two O–H⋯O=C hydrogen bonds. One of the hy­droxy groups inter­acts with the pyrazolone carbonyl O atom and the other hy­droxy group inter­acts with the amide O atom of another component, generating a chain motif. Adjacent chains are linked into a layer motif via N—H⋯O inter­actions involving only the heterocyclic acetamide component.