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In the title compound, [Na(C6H3Cl2O3S)(H2O)]n, the NaI ion is penta­coordinated by three dichloro­benzene­sulfonate anions and two water mol­ecules, forming a distorted trigonal-bipyramidal geometry. The NaI ions are bridged by the sulfonate groups and the water mol­ecules, leading to a polymeric layer structure parallel to the bc plane in which O—H...O hydrogen bonds are observed.

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In the title compound, C18H21NO3, the oxazolidine ring adopts an envelope conformation with the N atom at the flap position. The two benzene rings make dihedral angles of 74.27 (14) and 73.26 (15)° with the mean plane through the oxazolidine ring. In the crystal structure, O—H...O and C—H...O hydrogen bonds connect adjacent mol­ecules into chains along [010] incorporating R22(8) loops and further stabilization is provided by weak inter­molecular C—H...π inter­actions.
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