Tetrahydrofuran, also known as oxyheterocyclopentane and 1,4-epoxybutane, is a heterocyclic organic compound, chemical formula C4H8O, belonging to ethers, which is a completely hydrogenated product of furan. It is a colorless transparent liquid, soluble in water, ethanol, ether, acetone, benzene, etc. It is mainly used as solvent, chemical synthesis intermediate, and analytical reagent.
   On October 27, 2023, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization was preliminarily collated for reference, and tetrahydrofuran was included in the list of Category 2B carcinogens

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