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In the title adduct, C7H7NO3.C7H10N2, the dihedral angle betwen the benzene ring and pyridine rings is 9.60 (8)° while the nitro group attached to the benzene ring makes a dihedral angle of 21.76 (13)°. The hydroxyl O atom deviates by 0.0247 (15) Å from the plane of the benzene ring. The crystal packing features O—H...N hydrogen bonds.

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In the title adduct, 2C6H5NO3·C4H9NO, the morpholine ring adopts a chair conformation. The dihedral angle between the two nitro­phenol rings is 69.47 (9)°. The nitro groups attached to the benzene rings make dihedral angles of 3.37 (16) and 3.14 (13)° in the two mol­ecules of nitro­phenol. The crystal structure is stabilized by N—H...O, O—H...N and O—H...O hydrogen bonds and further consolidated by C—H...O inter­actions, resulting in a three-dimensional network.
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