a term used by psychedelic chemist alexander shulgin to describe the six actively psychedelic phenethylamines he felt had the most profound and significant effects. these include "2C-B", "2C-T-7", "2C-T-2", "Mescaline", and "DOM" ("STP"). many people think that "MDMA" and "MDA" are part of this group, but nah dude.