<unk>  is a heterocyclic organic compound with the chemical structure shown at right. It is an aromatic compound that has two benzene rings fused to a central furan ring. All the numbered carbon atoms have a hydrogen atom bonded to each of them. It is a volatile white solid that is soluble in nonpolar organic solvents. It is obtained from coal tar, where it exists as a 1% component.
Dibenzofuran
Triphenylbromoethylene
Desmethylchlorotrianisene
Triphenylchloroethylene
Paraquat
Vinyl chloride
Chlorotrianisene
Diiodohydroxyquinoline