Noun
English Wikipedia has an article on:furanoseWikipedia
furanose (plural furanoses)
(chemistry) any cyclic hemiacetal form of a monosaccharide having a five-membered ring (the tetrahydrofuran skeleton)
Conversion between the furanose, acyclic, and pyranose forms of D-glucose. Source: Internet
The open-chain form is limited to about 0.25% and furanose exists in negligible amounts. Source: Internet
Four isomers are cyclic, two of them with a pyranose (six-membered) ring, two with a furanose (five-membered) ring. Source: Internet