anti-tumor action, four of them showed the same anti-tumor potency as that of cytarabine. The preliminary toxicity evaluation revealed that the LD50 values of 6a–p should be more than 500 mg/kg. With CT DNA as model system an intercalating mechanism was explored. Using 3D QSARanalysis the relationship of the in vivo anti-tumor activity and the structure was quantitatively described. By docking 6a–p