(2E,4E)-Ethyl 5-(2,4-di-chloro-phenyl-sulfon-yl)penta-2,4-dienoate.

In the title compound, C13H12Cl2O4S, both C=C double bonds adopt an E conformation. The S atom has a distorted tetra­hedral geometry with bond angles ranging from 103.03 (12) to 118.12 (13)°. The eth­oxy­carbonyl group is disordered over two sets of sites, with site-occupancy factors of 0.739 (11) and 0.261 (11). In the crystal, C—H⋯O inter­actions link the mol­ecules into chains mol­ecules running parallel to the a axis.