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The title compound, C20H15N3O3, consists a phthalo­nitrile group and an iso­indole-1,3-dione group connected by a flexible butoxy chain. The dihedral angle between these two groups is 70.47 (3)°. Partial face-to-face overlap between the phthalo­nitrile groups of centrosymmetrically related mol­ecules is observed. In addition, the crystal packing is stabilized by C—H...O hydrogen bonds.

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In the title compound, C17H9N3O2, the phthalonitrile group and the isoindole-1,3-dione group lie in approximately orthogonal planes and exhibit a dihedral angle of 92.76 (8)°. Partial face-to-face overlap is observed between the two groups. In addition, the crystal packing is stabilized by C—H...O and C—H...N inter­actions.
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