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“Ascertaining the involvement of a novichok agent and its biotransformation products in this case was only achieved several days after establishing the diagnosis of cholinesterase inhibitor poisoning and did not affect therapeutic decision,” they write.

Novichok belongs to a broad class of compounds called cholinesterase inhibitors, which are used in a wide range of medicines as well as poisons.

German doctors announced Aug. 24 that he showed symptoms of poisoning with a cholinesterase inhibitor, a class of chemical agents that includes Novichok and other nerve agents.

Novichok is part of a class of cholinesterase inhibitors, which prevent nerves from giving “messages” to muscles, triggering a cascade of collapse of bodily functions.

It is a cholinesterase inhibitor, part of the class of substances that doctors at the Berlin hospital the Charité initially identified in Navalny.