Compounds for ameliorating or treating malignant tumor diseases have been proposed, but many of those cannot be orally taken and have placed a burden on patients. Mangiferin has the effect of ameliorating malignant tumor diseases through oral intake, but the effect is small, and it has been realistically not easy to take mangiferin. Furthermore, a novel or improved form of an existing drug for inhibiting a kinase such as NIK has been constantly needed for development of a more effective medicine and the like for treating malignant tumor diseases. According to the present invention, formula (1), formula (2), formula (3), formula (4), formula (5), formula (6), and formula (7) are effective when being orally taken, and can exhibit the effect in small amounts compared to mangiferin.