Pre-Ban Vs Post-Ban Analogues

The distinction between “pre-ban” and post-ban mephedrone is made everywhere mephedrone is discussed, but has this been “gotten to the bottom of”?
I never had pre-ban mephedrone and wasn’t even aware of its existence until about a year ago. I was surprised by how close/similar it is to MDMA/MDA, only of much shorter duration.

I’ve had 3 different batches from different vendors of it so far. The first one was a yellow/orange-ish fine crystalline powder, the second was the same color but larger crystals, and the third is large white crystals and sticky smaller crystals (similar to this). The third one, though it tastes and feels (in the nose) like the previous two batches and has some kind of serotonergic effect (plus DA/NE), is nowhere near as powerful/good as the first two. The serotonergic effect means it’s not 3-MMC. Could it be 4-MEC?

For all you mephedrone fans out there who keep up to date with the RC and MDxx substitutes scene(s), I would like to ask: Have we figured this out yet? Do we know why post-ban mephedrone is universally(?) regarded as not as good as pre-ban?

Do we have lab data from post-ban samples?

I assume pre-ban was very pure mephedrone. Does it make sense to think that most post-ban mephedrone batches use a different synth method, and therefore somehow the molecule, even if it’s structurally 4-MMC, doesn’t have the exact same properties due to some factor like 3D structure, SAR, lipophilicity, …? Or does this idea denote biochemical ignorance?

What about its chirality? Do some synths create more of one stereoisomer over another rather than a 50/50 racemic compound?

I await to hear from the most advanced drugs discussion forum on the planet about this mystery!

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