| 摘要 |
Orally administrable 5-fluorouracil derivatives of the general formula: <IMAGE> [wherein R1 is aryl or substituted aryl; R2 is acyclic or cyclic alkyl, adamantyl, aryl or substituted aryl; R3 and R4 are the same or different, each representing hydrogen atom or lower alkyl] effective against malignant tumors. |
