Nyodene D chemical in White Noise is not real but is fictional. The substance doesn't exist in real chemical world.
Don DeLillo created a fictional toxin chemical as one of the primary contexts of his book. In the novel, the chemical is said to be a whole bunch of things that have been mixed that are the byproducts and waste material of the insecticide manufacturer.
He presents the toxin as a chemical that can cause tumors in healthy rats when examined. The creator makes symptoms of toxin as nausea, skin irritation, sweaty hands, and vomiting, along with persistent feelings of déjà vu, which are eventually replaced by coma, convulsions, and miscarriages.
Though the toxin reaction sounds much more dangerous for the present world, we still need to remember that the toxin only exists in an imaginary world.
Don got all his inspiration for the poison from a real-life event he saw on television. Don's only motive for creating this kind of toxicity in his novel is for people to be alert for those situations.
Due to this toxin, people seem to have a mass panic situation. People immediately follow the route of government-assigned places. But the impact of the symptoms and the eventual loss of life due to the toxins make people do unimaginable things that makes them question their morality.
People are so engrossed in the morality of society people throw away the facade of morality when it comes to the way of survivability. And we can see such examples in the novel.
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