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Examples of crystal structures that are observed to have X–HBD interactions including (PDBIDs) (a) 2Q6H,24 (b) 2QU3,25 (c) 2WHO,26 (d) 4ALI,27 (e) 4X8T,28 and (f) 4DT6.29 Carbons are colored in cyan, hydrogens white, oxygens red, sulfurs yellow, chlorines green, and bromine is colored in dark red in panel c.
