The present invention provides a compound of the following Formula (1) or a pharmaceutically acceptable salt thereof: Formule (i) wherein X is an oxygen atom and the like; Y is -CO-, -S02-and the like; R1 is an optionally- substituted C1-6 alkyl group, an optionally-substituted C1-6 alkylcarbonyl group and the like; R2 is an optionally- substituted C1-6 alkyl group, an optionally-substituted C1-6 alkoxy group, an optionally-substituted amino group, an optionally-substituted 5- to 12-membered monocyclic or polycyclic saturated heterocyclic group and the like; R3, R4, R5, and R6 are independently a hydrogen atom and the like which exhibits excellent effects in suppressing the proliferation and sphere-forming ability of cancer cells, and can be useful as an antitumor drug or cell growth inhibitor.
本发明提供以下式(1)的化合物或其药学上可接受的盐:式(i)其中X是氧原子等;Y是-CO-,-S02-等;R1是可选择地取代的C1-6烷基,可选择地取代的C1-6烷基羰基等;R2是可选择地取代的C1-6烷基,可选择地取代的C1-6烷氧基,可选择地取代的
氨基,可选择地取代的5-至12-成员的单环或多环饱和杂环基等;R3、R4、R5和R6独立地是氢原子等,对抑制癌细胞的增殖和球形形成能力具有出色效果,并可用作
抗肿瘤药物或细胞生长
抑制剂。