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Anethole (or trans-anethole) is an aromatic compound that accounts for the distinctive "licorice" flavor of anise, fennel, and star anise. It may also be referred to as p-propenylanisole, anise camphor, isoestragole, or oil of aniseed. It is unrelated to glycyrrhizic acid, the compound which makes licorice taste sweet. The full chemical name is trans-1-methoxy-4-(prop-1-enyl) benzene.
Anethole appears as white crystals at room temperature. Its melting point is 21 0C, and its boiling point is 234 0C. It has a chemical formula of C10H12O, and is closely related to estragole, an aromatic compound found in tarragon and basil.
Anethole is distinctly sweet as well as having its flavoring properties and is measured to be 13 times sweeter than sugar. It is perceived as being pleasant to the taste even at higher concentrations.