The only mention of what the flavour was, was this:

In research published in Nature Communications, USC Dornsife neuroscientist Emily Liman and her team found that the tongue responds to ammonium chloride through the same protein receptor that signals sour taste.

"If you live in a Scandinavian country, you will be familiar with and may like this taste," says Liman, professor of biological sciences. In some northern European countries, salt licorice has been a popular candy at least since the early 20th century. The treat counts among its ingredients salmiak salt, or ammonium chloride.

So is this 'mediciney' flavour, then? (black licorish, ouzo, root beer, those weird candies they sell at ikea...)