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Au3+ binding to the accessible G7-C17 base pair of the subtype-B DIS duplex. (a) Stereoview showing the accessibility of the G7b-C17a pair bound to a gold cation. The composite simulated annealing omit map contoured at 1.3 σ is shown in blue and the anomalous difference map contoured at 13.0 σ above mean level in orange. (b and c) Schematic drawing showing interactions occurring between the cytosine, the gold(III) and the deprotonated guanine.
