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In the title compound, C 25 H 23 BrN 2 O 4 , the seven-membered ring adopts a twisted-boat conformation. The indole ring system is planar within 0.021 (2) Å and the ester group [–C(=O)—O—C–] is almost coplanar with it [dihedral angle = 3.0 (2)°]. The conformation of the ester group is influenced by intra­molecular C—H⋯O inter­actions. In the crystal structure, mol­ecules are linked into chains along the  b  axis by C—H⋯N hydrogen bonds.

tert-Butyl 3-(8-bromo-4H,10H-1,2-oxazolo[4,3-c][1]benzoxepin-10-yl)-2-methyl-1H-indole-1-carboxylate