Compounds containing an unfused furan ring (whether or not hydrogenated) in the structure
2furaldehyde "furfuraldehyde"
Furfuryl alcohol and tetrahydrofurfuryl alcohol
Heterocyclic compounds with oxygen heteroatom[s] only, containing an unfused furan ring, whether or not hydrogenated, in the structure (excl. tetrahydrofuran, 2furaldehyde "furfuraldehyde", furfuryl alcohol, tetrahydrofurfuryl alcohol and sucralose)