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Stereo diagram of difference electron density of the active site of KPC-2 β-lactamase, showing bound S02030. Alternate conformations of the triazole-carboxylic acid moiety of S02030 are indicated (a and b). The difference density (Fo − Fc) map was calculated after 10 rounds of REFMAC refinement, with S02030 removed from the refinement and structure factor calculations. Density was contoured at 3σ.
