title: Synthesis of some DE and CDE ring analogs of camptothecin.
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis*; D002166:Camptothecin; D055598:Chemical Phenomena; D002621:Chemistry; D008722:Methods
chemical_list: D000970:Antineoplastic Agents; D002166:Camptothecin