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Figure 2 The packing of one layer found in the crystal structure of (I) viewed down the a* direction. Molecules are connected by short C–H⋯O contacts in the (1 0 0) plane. Only one set of short contacts (dashed lines) is shown for clarity. The symmetry codes are: (i) 2 − x, − + y, −z; (iii) 2 − x, + y, −z; (iv) x, y, z − 1. |