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" ... Organophosphate pesticides are a class of chemicals called irreversible cholinesterase inhibitors, meaning that they permanently block the enzyme that degrades the neurotransmitter, acetylcholine. First made in the 1950s as tamed versions of World War II nerve gases, malathion and parathion are long off-patent and are relatively inexpensive to purchase in bulk. ... "
" ... They said that the results of the analysis by the OPCW designated laboratories of biomedical samples collected by the OPCW team and shared with the Federal Republic of Germany “confirm that the biomarkers of the cholinesterase inhibitor found in Navalny’s blood and urine samples have similar structural characteristics” as the toxic chemicals belonging to chemicals that were added to a list by the Twenty-Fourth Session of the Conference of the States Parties in November 2019. But added that “this cholinesterase inhibitor was not listed in the Annex on Chemicals to the Convention.” Still, they called the poisoning one of “grave concern” as the chemical was a military nerve agent designed for bodily harm. ... "