Methylsulfonium is a chemical compound that contains a sulfur atom bonded to three methyl groups and a positive charge. It is often represented as CH33S+, indicating its structure. This compound is part of a larger class of organosulfur compounds, which are important in various biological and chemical processes. Methylsulfonium plays a role in the metabolism of sulfur-containing compounds in living organisms. It can be involved in the synthesis of methionine, an essential amino acid, and is also studied for its potential applications in organic synthesis and medicinal chemistry.