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The molecular structure of (I). Hydrogen bonds are shown as dashed lines and displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (i) −x + 2, −y + 2, −z + 1; (ii) −x + 1, −y + 2, −z; (iii) −x + 2, −y + 2, −z + 2.]
