Acetone cyanohydrin

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What Wikipedia says

Acetone cyanohydrin (ACH) is an organic compound with the formula (CH3)2C(OH)CN. It is a colorless liquid used in the production of methyl methacrylate, the monomer of the transparent plastic polymethyl methacrylate (PMMA), also known as acrylic. It liberates hydrogen cyanide easily, so it is used as a source of such.

Excerpt from the Wikipedia article “Acetone cyanohydrin”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jü, Public domain, via Wikimedia Commons.