furan

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fu·ran

(fyū'ran),
1. A cyclic compound found, usually in saturated form, in those sugars with an oxygen bridge between carbon atoms 1 and 4, or 2 and 5, or 3 and 7, for which reason they are known as furanoses.
2. Oxa-2,4-cyclopentadiene.

furan

(fūr′an″, fū-ran′) [ furfuran, a former name]
C4H4O, an organic aromatic hydrocarbon, similar in shape to benzene, containing four carbon atoms and one oxygen atom. It is the structural source from which many useful pharmaceuticals are synthesized, including a wide variety of antibiotics.
CAS # 110-00-9