(Z)-3-Allyl-5-(4-fluoro­benzyl­idene)-2-sulfanyl­idene­thia­zolidin-4-one

In the title compound, C13H10FNOS2, the sulfanyl­idene­thia­zolidine ring and the benzyl­idene ring are almost coplanar [dihedral angle between the two planes = 0.1 (2)°]. The mean plane through the allyl group is nearly perpendicular to the sulfanyl­idene­thia­zolidine ring, as indicated by the dihedral angle of 69.5 (5)° between them. In the crystal, mol­ecules are linked together by weak C—H⋯O hydrogen bonds involving the same acceptor atom, forming dimers parallel to (1-22).