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A view of compound I, showing the atom labeling. Displacement ellipsoids are drawn at the 50% probability level, H atoms not involved in hydrogen bonding have been omitted for clarity. [Symmetry codes: (i) −x + 1, –y + 1, −z + 1; (ii) x + 
, y − , z; (iii) −x + 
, −y + , −z + 1.]
