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In the title compound, C14H10N2O2S, the benzothia­zole and quinazoline ring systems are essentially planar with maximum deviations of 0.0127 (16) and 0.1588 (15) Å, respectively, and make a dihedral angleof 3.02 (5)°, which shows that the entire mol­ecule is almost planar. The O atoms deviate from the benzothia­zole ring system by 1.2231 (14) and −1.1989 (15) Å. The crystal packing features non–classical C—H...O hydrogen bonds and is further consolidated by π–π inter­actions [centroid–centroid distances = 3.7568 (8) and 3.8848 (9) Å].

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In the title compound, C28H21ClN2O3, the quinoline ring system is essentially planar with a maximum deviation of 0.0436 (17) Å. The isoxazole and cyclo­hexane rings adopt envelope conformations. The isoxazole ring is almost orthogonal to both the quinoline ring system and the cyclo­hexane ring, making dihedral angles of 85.75 (8) and 81.46 (9) °, respectively. The O atom deviates signifigantly from the six-membered carbocyclic ring by 0.3947 (16) Å. In the crystal, mol­ecules are linked into inversion dimers via pairs of C—H...O inter­actions, resulting in R22(24) ring motifs.
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