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Diethyl sulfate is a highly toxic and likely carcinogenic chemical compound with formula (C2H5)2SO4. [1] It is the diethyl ester of sulfuric acid and exists at room temperature as a colourless oily liquid with a faint peppermint odour. Diethyl sulfate is slightly soluble in water, but miscible with alcohol, diethyl ether, and most polar solvents. It readily decomposes in hot water to ethyl hydrogen sulfate and ethyl alcohol. [1,2]