Benzene

Benzene was a substance. Authorities recommended extreme caution and use of benzene applicators when approaching a criminal known as the "Marauder of Endor".

Behind the scenes
Benzene was mentioned in a one-page wanted poster, written by Bob Carrau for the 1993 book Monsters and Aliens from George Lucas, a publication that collects concept designs and photographs from various George Lucas projects. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical.

In the real world, benzene is an organic chemical compound, a natural constituent of crude oil, and one of the most basic petrochemicals.