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In the title thia­zolidine-4-one derivative, C20H21NO6S, the central thia­zolidine ring is essentially planar (r.m.s. deviation for all non-H atoms = 0.0287 Å) and forms a dihedral angle of 88.25 (5)° with the meth­oxy-substituted benzene ring and 74.21 (4)° with the 1,3-benzodioxole ring. The heterocyclic ring (with two O atoms) fused to benzene ring adopts an envelope conformation with the non-ring-junction C atom as the flap. In the crystal, the mol­ecules are linked into chains along [001] through weak C—H...O inter­actions, forming R44(28) edge-fused rings.
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