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Dimers of 9-aminoacridine linked via the 9-amino group with polymethylene chains, termed diacridines, are known to bisintercalate into DNA when the linker comprises 6 or more methylene units. There are no literature reports of crystal or NMR solution structures for bisintercalated diacridine-DNA complexes, and the issue of the structure of the C6 ([CH2 ]n linker where n = 6) diacridine complex remains unresolved. Previously, based on simple geometric considerations, it was proposed that C6 diacridine could only span a single base pair, which requires that i