Some stuff I randomly drew. The first ones on the left side are molecules I'm thinking about for a few years now, I have a feeling that there could be something good about them or that something similar could be a great substance. If anyone has thoughts about it I would be thankful for input. They are mainly a combination of the structures from Tilidine, Pethidine, Fencamfamine and Phenmetrazine. As those compounds are all very smooth and have nice effects as well as structures that can resemble opioids and stimulants at the same time I think there would be some potential to find something like a light speedball-like opi-stim. (I used "R" as a placeholder for whatever substitution would fit most.)
(//edit: I made a few mistakes; the nitrogen on the first molecule is not on the third unit for the phenethylamine-core (although the current position could make it more similar to a dissociative?) and the two chems below are the same ones, one should have the reverse ester)
The structures on the right side are just some boring -Phenidates and -Morphenates. I wonder if the N-methyl would make them simple pro-drugs to their parent compound? (I don't know why but I like morpholines and norbornanes somehow, similar to others who love benzodioxole units ^^)
On the left down side are just random chems I drew without much thinking.
I really don't know much about chemistry and have only learned (like many others) what I more or less know from looking at different chems, trying RC's and other substances, reading research papers and combine all that, more or less like the early alchemists who didn't really understand what they were doing ^^
//edit: I think this could have potential, HDMP-28 is strong with a short duration, Isopropylphenidate is smooth with a long duration, maybe it would make the HDMP a bit lighter with longer effects. And the methylmorphenate-analogue without isopropyl as it's already weak.