Crystal structure of (±)-3-[(benzo[d][1,3]dioxol-5-yl)meth­yl]-2-(3,4,5-tri­meth­oxy­phen­yl)-1,3-thia­zolidin-4-one

In the title thia­zolidine-4-one derivative, C(20)H(21)NO(6)S, 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 R (4) (4)(28) edge-fused rings.