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The ring angles at the unsubstituted nitrogen atoms are narrow, at 115.57\u2005(12) and 115.19\u2005(12)\u00b0, respectively, whereas the angle at the carbon atom between these N atoms is very wide, 127.97\u2005(13)\u00b0. The interplanar angle between the two rings is 79.56\u2005(5)\u00b0. The molecules are linked by three classical hydrogen bonds, forming a ribbon structure. 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