Found in anise oil, fennel and vanilla. Flavouring ingredient Anisaldehyde, or anisic aldehyde, is an organic compound that consists of a benzene ring substituted with an aldehyde and a methoxy group. It is a clear colorless liquid with a strong aroma. It comes in 3 varieties, ortho, meta, and para in which the two functional groups (methoxy and aldehyde) are alpha, beta, and gamma, respectively to each other. The unmodified term anisaldehyde generally refers to the para isomer. Anisaldehyde is found in anise, from which it gets its name. It is similar in structure to vanillin. (Wikipedia)