1-tert-Butyl 2-ethyl 5-bromo-3-(thio­phen-2-ylcarbon­yl)-1H-indole-1,2-dicarboxyl­ate

In the title compound, C21H20BrNO5S, the thio­phene group is located above the mean plane of the indole ring and displays rotational disorder (i.e. rotation through 180°). The site occupancy of the major component is 0.902 (2), while that of the minor component is 0.098 (2). In the crystal, pairs of weak C—H⋯O inter­actions link the mol­ecules into centrosymmetric dimers.