There have been previous threads on the use of the spice vanilla in the wine of the Kingdom of Judah. (See thread below.)
Vanillin is the organic substance extracted from the vanilla Bean. Vanillin can also be found in lower concentrations naturally in grapes and other organic substances. The higher concentration of vanillin found in at least five recovered ancient jars, however, can only be attributed to the import of the distant spice vanilla.
Here are good articles on the findings.
http://www.sci-news.com/archaeology/ancient-vanilla-wine-10794.html
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0266085