Vanilla

va·nil·lin (va-NIL-en, VA-nilin) a

(Chemistry / Elements & Compounds) a white crystalline aldehyde found in vanilla and many natural balsams and resins; 3-methoxy-4-hydroxybenzaldehyde. It is a by-product of paper manufacture (as well as other sources) and is used as a flavouring and in perfumes and pharmaceuticals. Formula: (CH3O)(OH)C6H3CHO

- from Wikipedia Dictionary