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The title compound, C 15 H 12 O 2 S, features three fused rings with a dihedral angle of 79.6 (2)° between the isopropenyl group and the thio­phene ring. In the crystal, mol­ecules are connected into a supra­molecular helical chain  via  C—H⋯O contacts.

9-Isopropenyl-4-methyl-2H-thieno[2,3-h]chromen-2-one