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ChEBI: Dimethyl sulfoxide is a 2-carbon sulfoxide in which the sulfur atom has two methyl substituents. It has a role as a polar aprotic solvent, a radical scavenger, a non-narcotic analgesic, an antidote, a MRI contrast agent, an Escherichia coli metabolite, a geroprotector and an alkylating agent. It is a sulfoxide and a volatile organic compound.