The title compound, C(38)H(36)N(2)O(2)S, has a heterocyclic ring that assumes a half-chair conformation. The phenyl rings of neighbouring mol-ecules align forming alternating chains parallel to [100] within the crystal packing. The absolute stereochemistry of the crystal was confirmed to be R,S at the 1- and 3-positions, respectively, by proton NMR spectroscopy. A single intra-molecular N-H⋯N hydrogen bond is observed.