A member of the class of pentachlorobenzenes that is benzene in which five of the hydrogens are replaced by chlorines. Now classed as a persistent organic pollutant under the Stockholm Convention.
pentachloronitrobenzene
pentachlorophenol
perfluorononanoic acid
perfluorooctane-1-sulfonic acid +
perfluorooctanesulfonamide +
polybromobiphenyl +
polybromodiphenyl ether +
polychlorinated dibenzodioxine +
polychlorinated dibenzodioxines and related compounds +