PCT No. PCT/JP81/00045 Sec. 371 Date Nov. 2, 1981 Sec. 102(e) Date Nov. 2, 1981 PCT Filed Mar. 5, 1981 PCT Pub. No. WO81/02577 PCT Pub. Date Sep. 17, 1981.Novel condurango glycoside compounds, antitumor agents comprising them and processes for their preparation, compositions containing them and methods of treating tumor with them are disclosed herein in which the novel condurango glycoside compounds are represented by the following formula (I): IMAGE IMAGE where X together with the 13 and 14 position carbon atoms is a group selected from the group consisting of IMAGE IMAGE +TR IMAGE
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