Naphthalenes. Two-ring crystalline hydrocarbons isolated from coal tar. They are used as intermediates in chemical synthesis, as insect repellents, fungicides, lubricants, preservatives, and, formerly, as topical antiseptics. . 0.49
Naphthoquinones. Naphthalenediones . Naphthazarins . Naphthalene rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups. . 0.44
Perylene. Peri-Dinaphthalene . Peri Dinaphthalene . Perilene . A 20-carbon dibenz(de,kl)anthracene that can be viewed as a naphthalene fused to a phenalene or as dinaphthalene. It is used as fluorescent lipid probe in the cytochemistry of membranes and is a polycyclic hydrocarbon pollutant in soil and water. Derivatives may be carcinogenic. . 0.42