The title compound, C25H20N2O4, is a new spiro-isoxazoline derivative. It contains a five-membered isoxazoline ring (A), a tetralone unit (E and D), a 4-nitrophenyl substituent (B), and a phenyl ring (C). The isoxazoline ring (A) has an envelope conformation, while the cyclohexenone ring (D) has an intermediate sofa/half-chair conformation. The aromatic ring of the 4-nitrophenyl substituent (B) is inclined at an angle of 78.97 (10)° to the phenyl ring (C). The rigid pharmacophore site, Osp
2—C—C—Osp
3, is characterized by an O⋯O distance of 3.113 (2) Å and an O—C—C—O torsion angle of 97.8 (2)°. In the crystal structure, molecules are linked by C—H⋯O contacts.
The title compound, C14H8N4O6, a new 1,2,5-oxadiazole N-oxide derivative, was formed by dimerization of 4-nitrobenzaldehyde oxime. The compound crystallizes with two independent molecules per asymmetric unit. The N-oxide O atom is disordered over two sites in each molecule; site occupancy factors are 0.57/0.43 and 0.5/0.5. The mean planes through the two benzene rings are inclined to the planar 1,2,3-oxadiazole ring by 25.03 (11) and 41.64 (11)° in one molecule, and 22.58 (11) and 42.66 (11)° in the other molecule, the smaller angle being for the ring on the oxide side of the oxadiazole ring in each case. In the crystal structure, the individual molecules form centrosymmetric dimers linked via C—H⋯O hydrogen bonds. The dimers of one molecule are then linked to those of the other molecule via C—H⋯O hydrogen bonds, forming a three-dimensional network.
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