In the title mol-ecule, C(20)H(22)F(3)N(3)OS, the piperazine ring has a chair conformation, and the N-C(=O)-C-N torsion angle is -59.42 (14)°. In the crystal, weak C-H⋯O and C-H⋯π inter-actions link the mol-ecules into layers parallel to (101).