Synthetics
Mesitene lactone has no reported odor.
Luebke, William tgsc, (1989): Sweet caramel sugar green licorice balsam gourmand
Givaudan: Sweet, caramel, licorice, balsamic
Levistamel has a sweet note of caramelised sugar with a green, celery, balsamic and aromatic background. at levels up to 1% levistamel can add an interesting effect in herbal and pine fragrances. it can be used to increase the sweetness of a fragrance, especially when seeking to reduce levels of vanillin.