fenethylline is the one I was thinking, the captagon active.
Could other xanthine-PEA combos be built to get around the analogue act? I mean, there's no law against these sorts of prodrugs.
Or would the synthetic route require you to first synthesize, or produce as a byproduct, the already illegal compound first?
Obviously using theophylline as the methylxanthine wouldn't work, since fenethylline is a scheduled drug, so I suppose a MDMA-phylline combo would be an analogue of fenethylline.
But what about caffeine or theobromine? I haven't bothered to look at structures or chemistry for this yet, so don't flog me too hard if these are completely impossible.