I watched this last night. Inside Porton Down: Britains offensive weapons. learn the difference between Sarin and VX. Spreading of diseases Past.

 https://www.bbc.co.uk/programmes/b07hx40t

VX

Chemical compound

Description

Description

VX is an extremely toxic synthetic chemical compound in the organophosphorus class, specifically, a thiophosphonate. In the class of nerve agents, it was developed for military use in chemical warfare after translation of earlier discoveries of organophosphate toxicity in pesticide research. Wikipedia

Formula: C₁₁H₂₆NO₂PS

Molar mass: 267.3657 g/mol

Boiling point: 298 °C

Density: 1 g/cm³

Melting point: −51 °C (−60 °F; 222 K)

LD₅₀ (median dose): 7 µg/kg (intravenous, rat)