It has a vanilla note, but so does plain old Coca Cola.
My point in saying this formula probably tastes like New Coke is that none of these formulas are exact to what was marketed 100 years ago.
They got off cane sugar (except some DP regional to small town Texas) years ago and Coca Cola used to contain cocaine.
So anything this formula contains may or may not be a current ingredient in Dr. Pepper.
It also has citrus notes and I think it’s the very best diet cola really chilled.