Derivatives of 5 - fluoro - uracil, and their application of international application no.

摘要

Novel 5-fluorouracil derivatives of the general formula: IMAGE wherein R1, R2 and R3 each represent hydrogen atom or methyl group, and R4 represents a straight or branched alkyl or alkenyl group, which has low toxicity and improved antitumor activity, and novel antitumor preparations containing the said 5-fluorouracil derivative.