、 5-Acetylamino-8-chloro-4-thiochromanone 、 5-Acetamino-8-methyl-4-thiochromanon 以to produce 171 mg of the title compound的产率得到3,5-Diacetylamino-8-chloro-4-thiochromanone
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Method for treating leukemia with a hexa-cyclic compound
A novel hexa-cyclic compound, a derivative of camptothecin, of the general formula: ##STR1## The compound is prepared from an aminoketone compound and a pyranoindolizine compound by the condensation-ring closing reaction. It is abundantly water-soluble, and has an excellent antitumor activity and a high degree of safety, and can be applied as an antitumor medicine for curing tumors of various kinds.