Chlorpyrifos

Navalny, a Russian anti-corruption activist and well-known critic of President Vladimir Putin, is being treated in Germany for an apparent case of poisoning by an "organophosphorus neurotoxin." But which one: the insecticide or the chemical weapon? Here are some clues.
In short, the public is often worried about chemical exposure, as they should be when such exposure exceeds a safe dose. The public’s interest is best served by trusting experts dedicated to public health protection and not by withholding scientific data from independent analysis.
The NRDC, known for its phony chemical scares, may have outdone itself. The group used every trick and half-truth in the book in making a Facebook video claiming that Dow Chemical was using Nazi nerve gas on crops because the EPA okayed it. Good drama. Terrible science. As usual.