2T-MMDA-3a

2T-MMDA-3a, also known as 2-methylthio-3,4-methylenedioxyamphetamine, is a psychedelic drug of the phenethylamine, amphetamine, and MDxx families related to 3,4-methylenedioxyamphetamine. It is the derivative of MDA with a 2-methylthio substitution and is the analogue of MMDA-3a with a 2-methylthio group instead of a 2-methoxy group.
2T-MMDA-3a was included as an entry in Alexander Shulgin's book PiHKAL. Its dose was listed as greater than 12mg orally, its duration was listed as unknown, and its effects were not described. However, in Shulgin's 2011 book The Shulgin Index, Volume One: Psychedelic Phenethylamines and Related Compounds, he stated that a 12mg dose produced threshold effects, but he did not assess higher doses. In addition, Daniel Trachsel has classified 2T-MMDA-3a as a hallucinogen.
The chemical synthesis of 2T-MMDA-3a was described by Shulgin in PiHKAL. Numerous other sulfur-containing phenethylamine analogues are also possible.
2T-MMDA-3a was first described in the scientific literature by Shulgin in PiHKAL in 1991. It is a controlled substance in Canada under phenethylamine blanket-ban language.