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Reference.org
syn-Propanethial-S-oxide
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<p><i>syn</i>-Propanethial <i>S</i>-oxide (or (<i>Z</i>)-propanethial <i>S</i>-oxide), a member of a class of <a href="/facts/Organosulfur/sUxSSXwD">organosulfur</a> compounds known as <a href="/facts/Thiocarbonyl/wMf09spv">thiocarbonyl</a> S-oxides (formerly "<a href="/facts/Sulfine/IvIbgjTm">sulfines</a>"), is a volatile liquid that acts as a <a href="/facts/Lachrymatory_agent/SLJoBYEN">lachrymatory agent</a> (triggers tearing and stinging on contact with the eyes). </p>