plant-derived Eugenol occurs naturally in some essential oils we use, such as basil, bay, cinnamon, clove, lemongrass, palmarosa, petitgrain, rose, tagetes and ylang ylang. It has a pleasant, spicy aroma. Some people are sensitive to this constituent.
Eugenol (C10H12O2), is an allyl chain-substituted guaiacol, i.e. 2-methoxy-4-(2-propenyl)phenol. Eugenol is a member of the allylbenzene class of chemical compounds. It is a clear to pale yellow oily liquid extracted from certain essential oils especially from clove oil, nutmeg, cinnamon, and bay leaf.