A bifunctional photoreactive agent for crosslinking nucleic acids; intercalates into double-stranded regions in DNA or RNA and, upon UV irradiation, forms covalent adducts with pyrimidine bases; used to study different types of RNA from diverse organisms, including viruses.

A natural ligand for the SXR (active at 0.1 to 0.5 µg/ml) and inhibitor of several CYP isoforms (IC₅₀ = 10 µg/ml for CYP2D6).

A derivative of the photoactive probe psoralen that intercalates into DNA and forms DNA single-strand adducts and interstrand crosslinks when activated with UV light.