trans-β-Farnesene, also known as (E)-β-farnesene, is a member of a group of sesquiterpene isomers, three of which occur in natural oils. The natural trans-β compound is used by aphids as a death signal to warn away other individuals and by potatoes to repel insects. A California company is using synthetic mixed farnesenes as a starting material for products ranging from biodiesel to perfumes.
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