The camptothecin  -lectone.
D000470:Alkaloids / Q000138:chemical synthesis*; D000970:Antineoplastic Agents / Q000138:chemical synthesis*; D007783:Lactones / Q000138:chemical synthesis; D011804:Quinolines / Q000138:chemical synthesis; D013329:Structure-Activity Relationship; D013729:Terpenes / Q000138:chemical synthesis
D000470:Alkaloids; D000970:Antineoplastic Agents; D007783:Lactones; D011804:Quinolines; D013729:Terpenes