A saturated hydrocarbon, C6H6, in which the six carbon atoms are arranged at the corners of a triangular prism. The structure was suggested in 1869 by Albert Ladenburg as a possible structure for benzene (since referred to as Ladenburg benzene). The actual compound was synthesized by Thomas J. Katz and Nancy Acton in 1973. Hexamethylprismane, in which the carbon atoms are linked to methyl groups rather than hydrogen atoms, was synthesized in 1966.