Assertion: chemical weapon | /r/HasProperty | employed in wwi
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Source sentences:
text: Examples of these substances are phosgene (the most lethal chemical weapon employed in WWI), which has been used as a chemical weapon but which is also a precursor in the manufacture of many legitimate organic compounds (e.g. pharmaceutical agents and many common pesticides), and triethanolamine, used in the manufacture of nitrogen mustard but also commonly used in toiletries and detergents.