Overview:
Alpha-Ethyltryptamine, also known as α-ethyltryptamine, α-ET, or AET, is a psychoactive drug belonging to the tryptamine family.
AET was originally explored as an anti-depressant by Upjohn Chemical Company under the name Monase.
"Last week the Upjohn Co. withdrew Monase. a 'psychic energizer,' after reporting to FDA that widespread use since June 1961 had produced seven cases of aplastic anemia, four of them fatal—though the drug was tested in 3,500 patients, with no sign of damage to their blood-cell mechanisms, before it was marketed." - Time Magazine March 30, 1962 full article...
AET was moved into the U.S. Schedule I list of controlled substances in 1993.
It is structurally related to α-methyltryptamine but its pharmacological effects are very different. α-ET is not a hallucinogenic drug, its effects resemble more that of the empathogen-entactogens like MDMA (Ecstasy).