furans

/F Y UH1 R AH0 N Z/
noun
  1. 1

    Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms, two double bonds and an oxygen atom; especially the simplest one, C4H4O.

Source: https://en.wiktionary.org/wiki/furan, https://en.wiktionary.org/wiki/furans