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Possible biosynthetic pathways of the sesquiterpene hydrocarbons d8-α-copaene, d8-β-copaene, d8-α-cubebene, d8-β-cubebene and d8-δ-cadinene. As a stable isotope-labeled precursor, d3-MVL was added to isolated exocarp of ripe grapes of the Lemberger grape variety.
