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Kyiv, he claimed, was violating the international Chemical Weapons Convention with a variety of substances with the assistance of Western countries, including the psychochemical warfare agent BZ as well as hydrocyanic acid and cyanogen chloride.

To illustrate the nonintuitive nature of the quantum world, Schrödinger offered a famous thought experiment in which a hypothetical cat was placed in a box with one atom of a radioactive substance attached to a vial of hydrocyanic acid.

It said no deaths from mechanical injuries were visible and all symptoms were characteristic of a chemical weapons attack, particularly choking agents and organophosphorus agents or hydrocyanic acid.

Then in California the time-honored method of placing canvas tents over trees and fumigating them with hydrocyanic acid began to yield disappointing results in certain areas, a problem that led to research at the California Citrus Experiment Station, beginning about 1915 and continuing for a quarter of a century.

“Phosgene, chloropicrin, ethyl iodoacetate, diphenylcyanar- sine, trichlormethyl, chloroformate, dichlorethyl sulphide. Not to mention hydrocyanic acid.”