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Figure 1 The molecular structure of the title compound, showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. The ethylamino group (atoms N2,C6,C7/N2′,C6′,C7′: occupancies 0.5/0.5) and the 5-oxo (O2/O2′: occupancies 0.7/0.3) atom are positionally disordered. |