Propidium

Propidium Diiodide; Propidium Iodide; Diiodide, Propidium; Iodide, Propidium
Quaternary ammonium analog of ethidium; an intercalating dye with a specific affinity to certain forms of DNA and, used as diiodide, to separate them in density gradients; also forms fluorescent complexes with cholinesterase which it inhibits.