title: Synthesis of sesquiterpene antitumor lactones. 6. cis-8a-Vinyloctahydro-3H-2-benzopyran-3,7-dione, a precursor to vernolepin.
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis*; D001578:Benzopyrans / Q000138:chemical synthesis; D007783:Lactones / Q000138:chemical synthesis*; D008722:Methods; D012717:Sesquiterpenes / Q000138:chemical synthesis*; D014753:Vinyl Compounds / Q000138:chemical synthesis
chemical_list: D000970:Antineoplastic Agents; D001578:Benzopyrans; D007783:Lactones; D012717:Sesquiterpenes; D014753:Vinyl Compounds