PROBLEM TO BE SOLVED: To provide a therapeutic agent for diseases such as neuropathic pain associated with Nav1.7.SOLUTION: The present invention provides a compound represented by formula (1) or a salt thereof. [R1 is H, cyano, C1-4 alkyl or the like R2 and R3 are H, C1-6 alkyl, C3-10 cycloalkyl, 3-7 membered heterocycle or the like R4a-R4c are H, halogen, cyano, C1-4 alkyl or the like L is CR7R8 R7 and R8 are H, a hydroxy group, C1-4 alkyl, 3-7 membered heterocycle or the like m is 1-3].SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】Nav1.7が関与する神経障害性疼痛等の疾患に対する治療薬の提供。【解決手段】式(1)で表される化合物またはその塩。[R1はH、シアノ、C1-4アルキル等;R2及びR3はH、C1-6アルキル、C3-10シクロアルキル、3~7員の複素環等;R4a~R4cはH、ハロゲン、シアノ、C1-4アルキル等;LはCR7R8;R7及びR8はH、水酸基、C1-4アルキル、3~7員の複素環等;mは1~3]【選択図】なし
