Sarin, also know as Propan-2-yl-methylphosphonofluoridate, is a colourless and odourless liquid well-known to be used as a chemical weapon due to its extreme potency as nerve agent. It's extremely toxic to human and just by inhaling a concentration of 28 mg per cubic meter per minute can lead to death. Inhaling below the lethal does can potentially cause permanent neurological damage.