| abstract |
Physiologically active substances NK34896A and NK34896B, which each is represented by the general formula (1) (1) or the general formula (2) (2) (wherein X represents hydrogen or an optionally substituted, C1-8, linear or branched, aliphatic hydrocarbon group or optionally substituted, C3-8 alicyclic hydrocarbon group, and Y represents C1-4 alkyl) and analogues of these. They are usable as a preventive or alleviator for side effects of an antitumor and as an antitumor medicine. |