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In the crystal structure of the title compound, C 22 H 17 N 3 O, the oxazine ring has a half-chair conformation. The dihedral angles between the best least-squares plane through the pyridine rings and the planar part (O–C–C–C–N) of the oxazine ring are 72.14 (6) and 35.44 (7) , the smaller angle involving the pyridine ring adjacent to the oxazine O atom.(More)
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