Like other nerve agents, they are organophosphate compounds, but the chemicals used to make novichoks, and their final structures, are considered classified in the UK, the US and other countries.
Source: wiktionary
Organophosphate
Synonyms for "organophosphate"
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The paper found high levels of phased-out flame retardants like PCBs and PBDEs, as well as allegedly safe, newer replacements chemicals, such as chlorinated paraffins and organophosphates, across the globe.
Source: wiktionary