I'm bad at chemistry. Really bad. I freely admit I don't have a good answer. I was going to use Ethylvanillin as an example because it falls under the heading

I'm bad at chemistry. Really bad. I freely admit I don't have a good answer. I was going to use Ethylvanillin as an example because it falls under the heading of "artificial flavor", but as I reflect on your question further, I gather that you're telling me that even things known as "artificial flavors" could be acceptable ingredients to Endless West because artificial flavors (like Ethylvanillin) ultimately are derived from chemicals that are derived from plants.