Most commonly called quinoline, this compound is naturally found in coal tar. It was first extracted in 1834 by German chemist F. Runge and is now used as a flavoring agent, preservative, disinfectant and solvent. It can also be used to make fungicides, dyes, rubber chemicals, and drugs (especially anti-malarial medicines). It is one of several compounds that add to the bitterness in coffee. Although it is safe in our food, it is highly toxic in its vapor form. If inhaled, acute exposure can irritate respiratory tract and cause headaches, nausea, or a coma.
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