Based on @Diy nightmare's clone attempt. I felt it was too sweet & lacked some additional lemon note, so I dropped the sweetener & added 2.2% lemon FE. Purilum cookie IMO worked as well as Chemnovatic.
Possibly both lemons could be decreased a little (toi 3% & 2%) respectively and very little sweetener could be added (no more than 0.2%) but it seems to me a very close fit.