I wasn't referring to the MDMA used in the study, I was referring to my personal experiences with street MDMA, which will never be 100% pure and you will never be able to get it 100% pure either as it is illegally produced. I'm going to go through two batches of MDMA I've used:
White/off-white crystal, WEDINOS identified only MDMA no active cuts, Dutch lab said 96% pure, tested fine on Mandelin/Mecke/Marquis. 125mg resulted in incredible, absorbing peak, remarkable clarity, but a lot of anxiety during the come up and a quicker come down, no negative after effects just an after glow
Brown crystal, WEDINOS identified only MDMA again, no active cuts. Not sent for purity analysis, tested fine on Mandelin/Mecke/Marquis. 125mg resulted in smooth and drawn out effects, very clean but not as lucid, intense or absorbing. Much less anxiety on the come up and a slower return to base line. Little stomach discomfort days after but no negative effects, nice after glow.
Now that's my personal experience with two batches containing only MDMA as an active chemical that resulted in slightly different effects. Just because this isn't shown on your study doesn't mean I never experienced it (on multiple experiences with each batch)
Anyway this is derailing from OP a bit