1′-Methyl-4′-phenyl-2′′-sulfanylidene­dispiro­[indoline-3,2′-pyrrolidine-3′,5′′-1,3-thia­zolidine]-2,4′′-dione

The title compound, C(20)H(17)N(3)O(2)S(2), crystallizes with two mol­ecules in the asymmetric unit. The pyrrolo­dine rings have envelope conformations in both mol­ecules, the N atoms deviating by 0.574 (3) and 0.612 (2) Å from the mean planes through the other ring atoms. The 1′-methyl and 4′-phenyl groups on the pyrrolidine rings are substituted in equatorial positions. In the crystal, mol­ecules are linked into a three-dimensional network by N—H⋯O, N—H⋯N and C—H⋯O and N—H⋯π hydrogen bonds.