PROBLEM TO BE SOLVED: To provide a compound having low toxicity, and capable of controlling mutant KRAS-related signal.SOLUTION: There is provided a phenyl tetrahydropyridoindol derivative represented by the formula (Ia), where R1 and R2 are specific substituents, R3 is H or a C1 to 6 alkyl group, L is a linkage group, and m and n represent an integer of 0 to 4.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2020,JPO&INPIT【課題】低毒性で、変異ＫＲＡＳ関連シグナルを制御可能な化合物の提供。【解決手段】式（Ｉａ）で表されるフェニルテトラヒドロピリドインドール誘導体。[Ｒ１及びＲ２は特定の置換基；Ｒ３はＨ又はＣ１から６のアルキル基；Ｌは連結基；ｍ及びｎは０から４の整数を表す]【選択図】図６
