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The phthalo­nitrile derivative, C28H26N2O2, contains three aromatic rings, which are mutually almost orthogonal. The structure is stabilized by π–π stacking interactions.

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The crystal structure of the title compound, C25H13N3O2, is stabilized only by weak van der Waals interactions. The seven-membered ring has a boat conformation.

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In the title compound, C22H16N2O2S2, two benzene rings are connected by a phthalo­nitrile moiety, the dihedral angle between them being 47.9 (2)°. The crystal structure is stabilized by intermolecular C—H...N contacts.

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Im the title compound, C17H12N2O, the aromatic rings are twisted by 62.84 (4)° with respect to each other. There are no unusually short contacts between the mol­ecules and the crystal packing is controlled by weak van der Waals inter­actions.
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