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Hydrogen bonds, aromatic stacking contacts and σ-hole interactions are all noncovalent interactions commonly observed in biological systems. Structural data derived from the Protein Data Bank showed that methionine residues can interact with oxygen atoms through directional S...O contacts in the protein core. In the present work, the Cambridge Structural Database (CSD) was used in conjunction with ab initio calculations to explore the σ-hole interaction properties of small-molecule compounds containing divalent sulfur. CSD surveys showe