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Binary VX is referred to as VX2] and is created by mixing O-(2-diisopropylaminoethyl) O′-ethyl methylphosphonite (Agent QL) with elemental sulfur (Agent NE) as is done in the Bigeye aerial chemical bomb. It may also be produced by mixing with sulfur compounds, as with the liquid dimethyl polysulfide mixture (Agent NM) in the canceled XM736 8-inch projectile program.
QL itself is relatively non-toxic chemical. However, when reacted with sulfur, the corresponding sulphide of QL isomerizes into the highly toxic VX molecule.