Eugenol /juːɡɛnɒl/ is a phenylpropene, an allyl chain-substituted guaiacol. Eugenol is a member of the phenylpropanoids class of chemical compounds. It is a colorless to pale yellow oily liquid extracted from certain essential oils especially from clove oil, nutmeg, cinnamon, basil and bay leaf.[1][2][3][4] It is present in concentrations of 80–90% in clove bud oil and at 82–88% in clove leaf oil.[5]