I think it will be difficult to find a clone for this one. I have searched and searched.
Here is what I would suggest to help you get headed in the right direction.
Find you a good Ry4. Some prefer Inawera Ry4, FA Ry4 and TFA Ry4 Double.
You may find that Inawera and FA Ry4 are slightly a bit more concentrated.
I would start with your selected Ry4 as the base and then from there I would add some Acetyl Pyrazine (AP), some FA Caramel and some vanilla (your choice: many to choose from this is where DIY magic comes in play).
Example Recipe
Ry4 (your choice) 5 - 10%
Acetyl Pyrazine .5 - 1%
Other Flavors .5 -1.5%
(brown sugar, maple, cream(s), chocolate, etc)
Keep in mind that you may run into muted flavor if you mix at higher than 50/50
Please refer to a wonderful recipe by RocketPuppy found here:
Yes...yes...I know...it's been done so many times. Since I quit smokes, Ry4s are the only flavor combinations I don't get sick of after a few hours, so of course, I'm always on the quest for a great one. Since I started diy, I've easily mixed several hundred different versions of my own and others' recipes, with varying percentages, trying for perfection, and I wish I could say that in sarcasm. This one is indistinguishable from all the rest out there, but it just had something that clicked with my palette. This is almost identical to @wllmc's Ry4.
Click the pretty green for where to buy
5% ........Perfumers Apprentice - RY4 Double Flavor
0.2%......Perfumers Apprentice - Acetyl Pyrazine 5% PG
0.5% .....FlavourArt - Vanilla Bourbon
0.5% .....FlavourArt - Vienna Cream
0.5% .....FlavourArt - Caramel
For other flavor suppliers beyond what is linked above, click HERE.