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In the title compound, C 17 H 18 O 5 S, an analogue of the potent anti­cancer agent combretastatin A-4, the alkene C=C bond has a  cis  conformation and the C—C=C—C torsion angle is 9.0 (3)°. The dihedral angle between the benzene and thio­phene rings is 54.07 (4)°. The dioxene ring adopts a half-chair conformation, with the C atoms of the methyl­ene groups displaced by −0.325 (2) and 0.341 (3) Å from the plane of the other atoms. The C atoms of the two  meta -meth­oxy groups are close to being coplanar with their attached benzene ring [displacements = −0.025 (2) and −0.196 (2) Å], whereas the C atom of the  para -meth­oxy group is significantly displaced [by −1.107 (2) Å]. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules into [0-11] chains, which feature two different types of  R   2   2 (6) loops.

(Z)-5-(3,4,5-Trimethoxystyryl)-2,3-dihydrothieno[3,4-b][1,4]dioxine