From Wikipedia:

Diethyl malonate, also known as DEM, is the diethyl ester of malonic acid. It occurs naturally in grapes and strawberries as a colorless liquid with an apple-like odor, and is used in perfumes. It is also used to synthesize other compounds such as barbiturates,

artificial flavorings, vitamin B₁, and vitamin B₆.

On-line chemists like NileRed and Qwerty Qwerty show videos of interesting uses of this chemical. Several other videos show how you can synthesize this Diethyl Malonate yourself. But why synthesize so expensively if you can buy it so inexpensively here?

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