4.1.4.3A Furan-based Constituents: These constituents are derived from five-membered
heterocyclic ring ‘furan’, namely:
(a) Furfural (or 2-Furfuraldehyde): It is a heterocyclic aldehyde that usually occurs in the first fraction of many essential oils, belonging to the natural order-Pinaceae, for instance: Pinus palustris (Pine oil) and cade oil. It is also present in oil of orris rhizome, clove oil, petit-grain, lavender and cinnamon oils.
