| 摘要 |
Disclosed is a compound which has excellent anti-tumor activity and excellent oral absorbability and is useful as an anti-tumor agent. Specifically disclosed is a 3'-ethynylcytidine derivative represented by the general formula (1) [wherein X represents a (substituted) alkylcarbonyl group, a (substituted) alkoxycarbonyl group or a hydrogen atom; one of Y and Z represents a hydrogen atom or a group represented by the formula: (R1)(R2)(R3)Si-and the other represents a group represented by the formula: (R4)(R5)(R6)Si-; and R1, R2, R3, R4, R5 and R6 independently represent a (substituted) alkyl group, a (substituted) cyclic alkyl group or a (substituted) aryl group] or a salt thereof. |
