A synthetic anion-exchange polymer in which quaternary ammonium groups are attached to a copolymer of styrene and divinylbenzene. A white- to buff-colored powder having a particle size of 50–100 mesh, it is stable to 150C. Insoluble in water and organic solvents. It is effective in binding bile salts such as cholesterol. Research on test animals and in clinical trials on humans indicates that it is effective in eliminating from the body such toxic organochlorine compounds as “Kepone.”