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MS spectra of genuine (d0) and deuterium-labeled (d6 and d8) α-cubebene (left panel) after administration of [5,5-2H2]-1-deoxy-ᴅ-xylulose (d2-DOX) and [6,6,6-2H3]-(±)-mevalonolactone (d3-MVL) to isolated exocarp of grape berries (Lemberger cultivar). Expected labeling patterns are depicted for α-cubebene (right panel).
