N-​(2,​3-Dihydro-​1,​4-​benzodioxin-​6-​yl)​-​1,​2-​dihydro-​1-​methyl-​2-​oxo-4-​quinolinecarboxamide​ is an isoquinolinone compound and an inhibitor of TAF1, a TATVIP(LA)binding protein Associated Factor (TAF) of the RNA polymerase II transcription initiation factor complex TFIID (1,2).