I recently came across this paper by a professor of biology at the University of Oklahoma, Thomas S. Ray. In it he proposes the basis of the "entactogenic effect" of MDMA as Imadazoline-1. And suggests that this can be demonstrated by combining a selective serotonin-2 agonist (MEM, DOET, DOB, 2-CB-Fly) and an Imadazoline drug (the pharmaceuticals monoxodine or rilmenidine). A new way to have ecstasy? Very interesting, check it out. The paper The podcast version of the hypothesis