Dimethyl 1-(4-methyl­phen­yl)-8-(thio­phen-2-yl)-11-oxatricyclo­[6.2.1.0(2,7)]undeca-2,4,6,9-tetra­ene-9,10-dicarboxy­late

The title compound, C(25)H(20)O(5)S, is the product of a Diels–Alder reaction. The mol­ecule consists of a fused tricyclic system containing two five-membered rings and one six-membered ring. The five-membered rings both show an envelope conformation with the O atom at the flap, whereas the six-membered ring adopts a boat conformation. The thio­phene ring is disordered over two sets of sites with an occupancy ratio of 0.53 (1):0.47 (1). The dihedral angles between the 4-methyl­phenyl ring and the major and minor components of the thio­phene ring are 66.3 (1) and 67.9 (1)°, respectively, while the dihedral angle between the disordered thio­phenyl components is 3.1 (1)°. The mean plane of the tricyclic ring system makes dihedral angles of 35.8 (1), 30.8 (1) and 32.8 (1)°, respectively, with the 4-methyl­phenyl ring and the major and minor components of the thio­phenyl ring. In the crystal, inversion dimers are formed through pairs of C—H⋯π inter­actions. In addition, C—H⋯O inter­actions are observed.