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9,9'(10H,10'H)-Spirobiacridine and its 2-methoxy derivative were prepared from the corresponding diphenylamines and acridone in three steps. A nearly D 2d molecular skeleton of the spiro compounds was confirmed by X-ray crystallographic analysis. The spirobiacridines can work as a new class of host compounds owing to their ability to form nearly rectangular hydrophobic cages in the crystal.
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