3-(4-Fluoro­phen­yl)-2-(4-methyl­phen­oxy)-5,8,9-trimethyl­thieno[3′,2′:5,6]pyrido[4,3-d]pyrimidin-4(3H)-one

In the title mol­ecule, C₂₅H₂₀FN₃O₂S, the central tricyclic system is essentially planar. All bond lengths and angles are within normal ranges. The crystal packing is stabilized by π–π stacking inter­actions and van der Waals forces.