10.1021/jf060669a Prenylthiol or 3-methyl-2-butene-1-thiol is an organosulfur compound with the formula . It is a derivative of prenyl alcohol and hydrogen sulfide.
Prenylthiol is a fairly common components of roasted or cooked foods such as beer, including lightstruck or "skunky" beer. Some roasted coffee also owes it aroma to this thiol. The "skunk-like" aroma of burnt cannabis is attributed to prenylthiol.