8‐(2‐Bromo‐3‐methoxy‐3‐methylbutyl)‐7‐methoxycoumarin

The title compound, C₁₆H₁₉BrO₄, is a derivative of osthol, isolated from the seeds of Imperatoria Osthruthium. The structure was solved in space group P, with two mol­ecules in the asymmetric unit, and was refined to a final R factor of 0.064. The two mol­ecules in the asymmetric unit differ in the orientation of their brominated substituent group. The benzo­pyran ring displays aromatic character. The packing of the mol­ecules in the lattice is mainly due to C—H⋯O hydrogen bonds.