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In the title molecule, C18H20NO3PS, the benzene ring and the benzothiazole mean plane are almost coplanar, forming a dihedral angle of 2.29 (2)°. The two ethyl groups are each disordered over two conformations in ratios that refined to 0.59 (1):0.41 (1) and 0.56 (1):0.44 (1). In the crystal, weak intermolecular C—H...O hydrogen bonds link the molecules into layers parallel to the bc plane.