Chemical Weapons: VX (C11H26NO2PS)
It is an extremely toxic substance the only application of which is in chemical warfare as a nerve agent. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations in UN Resolution 687. The production and stockpiling of VX was outlawed by the Chemical Weapons Convention of 1993.
VX was originally developed in the United Kingdom in the early 1950s. It is odorless and tasteless. The extent of poisoning caused by VX depends on the amount of VX to which a person was exposed, how the person was exposed, and the length of time of the exposure.
It is possible that VX or other nerve agents were used in chemical warfare during the Iran-Iraq War in the 1980s.