PROBLEM TO BE SOLVED: To provide an anticancer agent blocking a specific signal transmission in vivo, having powerful activity of inhibiting cancer cell proliferation, and slight in side effects as well.SOLUTION: The anticancer agent is provided, comprising, as active ingredient, a compound represented by structural formula (1) (wherein, A and B are each H or 1-4C alkyl).COPYRIGHT: (C)2013,JPO&INPIT【課題】生体内での特定のシグナル伝達を遮断し、強力ながん細胞の増殖抑制作用を有し、かつ副作用も少ない抗がん剤の提供。【解決手段】下記の構造式(1):(式中、A及びBは、それぞれ水素、又は炭素数1~4のアルキル基を表わす。)で表される化合物を有効成分とする抗がん剤。【選択図】なし