VX nerve gas. Computer artwork of a molecule of the nerve gas VX (methylphophonothioic acid, S- [2(diethylamino)ethyl]-2-methylpropyl ester, chemical formula (C11. H26. N. O2.P.S)). The atoms are shown as spheres and are colour-coded: carbon (blue), oxygen (red), nitrogen (cyan), hydrogen (white), phosphorus (orange) and sulphur (yellow). The bonds between them are shown as cylinders. VX is used in chemical weapons. It is deadly and works in seconds. Skin contact or inhalation leads to disruption of the nervous system leading to convulsions, paralysis and death.