3-Phenyl-4H-furo­[3,2-c]­chromen-4-one

The crystal structure of the title compound, C₁₇H₁₀O₃, is the first example of a furocoumarin containing three fused rings. The tricyclic furocoumarin fragment is perfectly planar. The phenyl substituent forms a dihedral angle of 39.52 (8)° with the plane of the tricyclic system. The crystal packing involves centrosymmetric dimers interconnected by strong π-interactions between their furo­[3,2-c]­coumarin fragments [at distances of 3.42 (4) Å].