Naphthalene

consists of two BENZENE rings joined together (with the loss of some carbon and hydrogen--condensed) to give the formula C₁₀H₈. It is a white crystalline solid and is obtained from COAL TAR (in the fraction, or part, boiling between 180°C and 200°C) and from PETROLEUM fractions, by demethylation i.e. the removal of the METHYL group from methylnaphthalene. Naphthalene is more reactive than benzene and it is used mostly in the production of plasticizers and resins. Some derivatives of naphthalene are important in the manufacture of dyestuffs.

Taken from Dictionary of Science

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Naphthalene, also known as naphthalin, bicyclo[4.4.0]deca-1,3,5,7,9-pentene or antimite and not to be confused with naphtha, is a crystalline, aromatic, white, solid hydrocarbon with formula C₁₀H₈ and the structure of two fused benzene rings. It is best known as the traditional, primary ingredient of mothballs. It is volatile, forming an inflammable vapor, and readily sublimes at room temperature, producing a characteristic odor that is detectable at concentrations as low as 0.08 ppm by mass.

Taken from Wikipedia