2GB9:
reference: X-ray crystallographic study of DNA duplex cross-linking: simultaneous binding to two d(CGTACG)2 molecules by a bis(9-aminoacridine-4-carboxamide) derivative., Hopcroft NH, Brogden AL, Searcey M, Cardin CJ, Nucleic Acids Res. 2006;34(22):6663-72. Epub 2006 Dec 1. PMID: 17145714

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