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The complete mol­ecule of the title compound, C20H19NO5S2, is generated by a crystallographic twofold axis and the O atom and N—H group attached to the central benzene ring are statistically disordered. The dihedral angle between the central and terminal benzene rings is 56.91 (5)° and that between the terminal benzene rings is 29.80 (5)°. In the crystal, N—H...O hydrogen bonding links the mol­ecules into sheets lying parallel to the ab plane.

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In the title compound, C18H13F2NO5S2, the complete mol­ecule is generated by a crystallographic inversion centre, and the O atom and the N—H group attached to the central ring are statistically disordered. The dihedral angle between the central and terminal benzene rings is 64.03 (6)°. In the crystal, N—H...O, C—H...F and C—H...O inter­actions link the mol­ecules into a three-dimensional network.
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