many of the more obscure compounds in Pihkal and Tihkal are interesting, i have quite a few sitting a few feet from me. Id have to say pure opiates though as there hard to come by at all, except in liquid form, like IV dilaudid or morphine, and even then pharm shit is hard to come by, even pills. it all depends on what your looking for. If you mean what drug would you habituate endlessly if you could, then yea opiates and Nugs. But if you are talking about the kind of explorative fun you can have with psychedelics, id say 5-meo-amt, as its so close to serotonin and psilocin (its refered to as "O,-DimethylSerotonin") and as we all know (or maybe not) psilocin and serotonin differ by a hydroxyl group. fun shit
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"As your attorney i advise you to rent a very fast car with no top, and you'll need the cocaine."
My AIM: Thetripdoctor (im always on, Trust me)