<unk>  is a deadly carbamate nerve agent. It is lethal because it inhibits acetylcholinesterase. Inhibition causes an overly high accumulation of acetylcholine between the nerve and muscle cells. This paralyzes the muscles by preventing their relaxation. The paralyzed muscles include the muscles used for breathing. Patent assigned to US army for<unk>  among other similar nerve agents was filed in December 7, 1967.
EA-3990
EA-4056
RVT-802
LSM-775
D-DIA
IMEP 
TPA-023
OM-85