7-Benzyl-3-(4-chloro­phen­yl)-2-isobutyl­amino-5,6,7,8-tetra­hydro­pyrido[4′,3′:4,5]thieno[2,3-d]pyrimidin-4(3H)-one

In the title compound, C₂₆H₂₇ClN₄OS, the thienopyrimidine fused-ring system is close to coplanar (r.m.s. deviation = 0.0089 Å), with a maximum deviation of 0.0283 (17) Å for the N atom adjacent to the benzene ring. This ring system forms dihedral angles of 83.51 (3) and 88.20 (5)° with the adjacent benzyl and phenyl rings, respectively. In the crystal, N—H...Cl inter­actions and C—H...O hydrogen bonds are observed.