Novel 5-fluoro-2'-deoxyuridine derivatives and salts thereof, process for producing the same, and antitumor agents containing the same

Claim 1

A hydrate of 5-fluoro-2-deoxyuridine derivative represented by the formula [I] or a salt thereof: ##STR42## wherein R 1 and R 2 are different from each other, one of which represents a C 1-30 aliphatic carboxylic acid residue and the other represents a group represented by the formula, ##STR43## in which R 3 represents an oxido group, A represents a C 1-5 alkylene group and R 4 represents a tri-C 1-4 alkylammonio, pyridinio, pyridazinio, pyrimidinio, pyrazinio, 2H-imidazolio, 3H-imidazolio, 2H-pyrazolio, 1-methylpiperidinio, 4-methylmorpholinio or 2H-1,2,4-triazol-1-io group which are substituted or not substituted by at least one substituent selected from the group consisting of hydroxyl, C 1-4 alkoxy, acetyloxy, propionyloxy, C 1-4 alkyl and di-C 1-4 alkylamino groups.