Tear gas (from lacrima, tear and genesis, which generates) is a generic term for all the compounds causing temporary incapacitation through irritation of eyes and / or respiratory system.
Tear gas are the most common irritants chlorobenzylidene 2-malononitrile (also known as "CS", the initials of Corson and Stoughton, chemists have synthesized the molecule), chloroacetophenone (CN), dibenzoxazepine ("CR") and the respiratory irritant "OC pepper" spray.
للتفصيل اكثر انظر الى هدا المرجع
http://en.wikipedia.org/wiki/CS_gas
وعلى فكرة من مدة عملت على ها المركب يعني صنعه وتحاليله وهو جد خطير 8-|