S-Methyl methanethiosulfonate, also known as MMTS, is an organosulfur compound with the chemical formula . It is the S-methyl ester of methanethiosulfonic acid. It is a colorless liquid. It is obtained by condensation of methanesulfonic acid with methanethiol.
It has a role as a human metabolite. It is found in cytoplasm and extracellular fluid. It has been reported in Brassica oleracea (wild cabbage), Brassica family, Euglena gracilis, Trypanosoma brucei and Allium cepa (onion family).
S-Methyl methanethiosulfonate is used as a flavoring agent. It has a sulfurous, roasted and pungent odor and taste.
S-Methyl methanethiosulfonate is a compound with a small molecule that reversibly blocks cysteine and other molecules containing sulfhydryl groups, enabling the study of enzyme activation and other protein functions.
S-Methyl methanethiosulfonate causes skin irritation and corrosion. May cause serious eye irritation and serious eye damage. This compound is also a respiratory tract irritant.