In the crystal structure of the title compound, C(36)H(39)FN(4)OS, the two fused rings of the thienopyrimidine system are coplanar. The 4-fluoro-phenyl ring is twisted with respect to the heterocyclic pyrimidinone ring by 67.21 (14)°. The piperidine ring shows a half-chair conformation. One of the n-butyl chains is disordered equally over two sites. The crystal packing is stabilized by C-H⋯O hydrogen bonds.
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