Methods of forming camptothecin compounds which are effective anti-tumor compounds are disclosed. These compounds inhibit the enzyme topoisomerase I and may alkylate DNA of the associated topoisomerase I-DNA cleavable complex.
                            本发明揭示了形成有效的抗肿瘤化合物
喜树碱的方法。这些化合物抑制酶拓扑异构酶I,并可能烷基化相关的拓扑异构酶I-DNA可切割复合物的DNA。