Benzene (C6H6) is an aromatic hydrocarbon that was used an industrial solvent and as an additive in fossil-based fuels.
The complex hydrocarbon used on Earth called gasoline was made of such components as benzene, ethylene, and acetylene. (VOY: "The 37's")
Yalosians required ten percent of a room's atmosphere to be benzene, as well as sixty percent nitrogen and thirty percent hydrogen fluoride. (DS9: "Improbable Cause")