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In the title compound, C 13 H 10 ClFO 3 S 2 , the two-ring system is essentially planar, the mean plane of the benzene ring being inclined at 6.0 (2)° to the plane of the remaining four atoms. The ethyl­sulfanyl group is almost coplanar with the two rings [dihedral angle = 6.4 (2)°], while the carboxyl­ate group is almost perpendicular to it [dihedral angle = 72.4 (2)°]. In the crystal structure, inter­molecular C—H⋯O and C—H⋯F hydrogen bonds link the mol­ecules in a stacked arrangement along the  a  axis.

Methyl 7-chloro-2-ethylsulfanyl-6-fluoro-4-oxo-4H-thiochromene-3-carboxylate