I received research samples of each of the two isomers from my NIMH contacts, and set up a pretty much blind study. One of the results was clear and not unexpected. The "S" isomer was clearly the more potent one -- the effective dose was between 60 and 120 milligrams, whereas the "R" isomer was barely threshold at 160 milligrams. This was about a 2:1 weight ratio favoring the "S" or "stimulant" isomer as defining the action. What was unexpected was that neither isomer gave the magic of the racemic MDMA. It was almost as if both the separate pharmacological components needed to be present to experience the unusual properties of this drug.
http://www.cognitiveliberty.org/shulgin/adsarchive/isomers.htm[\quote]
By all accounts, either isomer of MDMA alone will be inferior to the racemic version. Also, it takes a LOT of extra time and money to make a sample enantiomerically pure.... there's no reason to do that if the end product is less sought out to begin with. So I'd be VERY wary of this "MDMA", seems like he may be trying to pass off something similar as MDMA and wants to cover his tracks by saying it's "r-MDMA"