Assertion: known nerve agent | /r/HasProperty | developed by chemist
Facets:
value: in 1952
type: TEMPORAL
value: at a british government facility
type: LOCATION
Source sentences:
text: VX, the most famous of the so-called V-series of persistent nerve agents (and also the deadliest known nerve agent; V is for venom), was developed by chemists at a British government facility in 1952.