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Figure 3 Fig. 3 The packing of (I), viewed down the c axis. Dashed lines indicate hydrogen bonds. The O1–H1⋯O21 intramolecular hydrogen bond forms a 6-membered ring and the N9–H9⋯O1(−x,1 − y,-z) intermolecular hydrogen bond forms a 10-membered ring; these favour the planarity of the title molecule (I). |