Compounds of the formula Iwherein X is a bond or -CH2, and pharmaceutically acceptable salts thereof are useful in the parenteral treatment of leukemia, myelodysplastic syndrome or lymphoma, especially in patients presenting with cytarabine resistance and/or over 60 years of age.本發明係關於式I化合物,其中X為一鍵或-CH2,及其醫藥學上可接受之鹽,其適用於非經腸治療白血病、骨髓發育不良症候群或淋巴瘤,尤其在呈現阿糖胞苷抗性及/或年齡超過60歲之患者。