"Benzene is an important organic chemical compound with the chemical formula C6H6. Its molecule is composed of 6 carbon atoms joined in a ring, with 1 hydrogen atom attached to each carbon atom. Because its molecules contain only carbon and hydrogen atoms, benzene is classed as a hydrocarbon.Benzene is a natural constituent of crude oil, and is one of the most elementary petrochemicals."@en . . . "Benzene"@en . "Benzene"@en . .