MEDICINAL COMPOSITION FOR PREVENTION OR ALLEVIATION OF SIDE EFFECT OF ANTITUMOR AND MEDICINAL ANTITUMOR COMPOSITION

摘要

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.