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Figure 2 The packing in the unit cell of (I) viewed down the a axis, showing the formation of (30) e dge-fused rings and also the hydrogen-bonding interactions as broken lines. Symmetry code: (i) −x + , y − , −z + ; (ii) x − , −y + , z − ; (iii) −x, −y + 2, −z + 1. |