Synonyms: 1,2,3,4,5-Pentachloro-6-[(Z)-1,2-dichlorovinyl]benzene;benzene, 1,2,3,4,5-pentachloro-6-[(Z)-1,2-dichloroethenyl]-;Benzene, pentachloro(dichloroethenyl)-;HEPTACHLOROSTYRENE;Pentachloro(dichloroethenyl)benzene;Styrene, heptachloro-;trans-Heptachlorostyrene