Once again, we have the H and we have the D.
So our D, the deteriorium, has a higher atomic weight, so it has a higher priority. And now we have an allochene where our two higher priority groups are on opposite sides of the double bond. And that means this must be an Eisomer. So let's look at rule number three. If we have the same atom, if we have a tie between our atoms, we move to the next atom. So let's see exactly what that means.