Bruceine A

The title compound, C26H34O11, known as bruceine A, is a natural quassinoid extracted from the dried fruits of Brucea javanica. Its structure consists of five fused rings including an oxygen-containing heterocyclic ring and a lactone ring. Two intramolecular O—H⋯O links help to establish the molecular conformation. In the crystal, O—H⋯O hydrogen bonds connect the molecules.