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The asymmetric unit of the title compound, C11H12N2O·C25H28N4O2, contains two different mol­ecules. The smaller is known as anti­pyrine [systematic name: 1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one] and the larger is built up from two antypirine mol­ecules which are connected through a C atom of the pyrazolone ring to a central propanyl part [systematic name: 4,4′-(propane-2,2-di­yl)bis­[1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one]. Intra­molecular C—H...O hydrogen bonds occur in the latter mol­ecule. In the crystal, C—H...O hydrogen bonds link the mol­ecules into a two-dimensional network parallel to (001).

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The title compound, also known as 7-nitro­tropolone, C7H5NO4, exists in the crystalline state as the 2-hy­droxy-7-nitro­cyclo­hepta-2,4,6-trien-1-one tautomer and not as 2-hy­droxy-3-nitro­cyclo­hepta-2,4,6-trien-1-one. The dihedral angle between the ring and the nitro group is 70.3 (2)°. In the crystal, neighbouring mol­ecules are linked into dimers by a pair of O—H...O hydrogen bonds. In addition, the crystal is stabilized by O...π [3.4039 (14) Å] and O...O [3.073 (2) Å] inter­actions.
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