6-Hydroxy-5-[(2-hydroxy-4,4-dimethyl-6-oxocyclohex-1-enyl)(4-nitrophenyl)methyl]-1,3-dimethylpyrimidine-2,4(1H,3H)-dione

6-Hydroxy-5-[(2-hydroxy-4,4-dimethyl-6-oxocyclohex-1-enyl)(4-nitrophenyl)methyl]-1,3-dimethylpyrimidine-2,4(1H,3H)-dione

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In the title compound, C21H23N3O7, the pyrimidinedione ring adopts a screw-boat conformation, whereas the cyclohexenone ring adopts an envelope conformation, with the C atom bearing the methyl groups as the flap atom.The dihedral angle between Bondage the mean planes of the pyrimidinedione and cyclohexenone rings is 58.78 (2)°.The pyrimidinedione and cyclohexenone rings form dihedral angles of 59.

94 (3) and 54.73 (2)°, respectively, with the 4-nitrophenyl ring.Relatively strong intramolecular O—H.O hydrogen bonds are observed.

In the crystal, molecules are linked Crates by C—H.O hydrogen bonds, forming a chain along the c-axis direction.