3-APBT

3-APBT, also known by its former developmental code name SKF-6678 and as 3-(2-aminopropyl)benzo[β]thiophene, as well as 1-thia-α-methyltryptamine (1-thia-AMT), is a monoamine releasing agent and serotonin receptor agonist of the benzothiophene group. It is an analogue of α-methyltryptamine (AMT) in which the indole ring has been replaced with a benzothiophene ring.

The drug acts as a potent and well-balanced serotonin–norepinephrine–dopamine releasing agent (SNDRA). It is also a full agonist of the serotonin 5-HT2 receptors, including of the serotonin 5-HT2A, 5-HT2B, and 5-HT2C receptors. 3-APBT produces the head-twitch response, a behavioral proxy of psychedelic effects, in rodents. It does not stimulate locomotor activity in rodents, suggesting that it does not possess stimulant-type effects. The drug has been reported be a weak monoamine oxidase inhibitor (MAOI), specifically of monoamine oxidase A (MAO-A) (IC50Tooltip half-maximal inhibitory concentration = 4,000–16,200 nM).

3-APBT was developed by Smith, Kline & French (SKF) as a potential pharmaceutical drug in the late 1950s. The drug and its positional isomer 2-APBT were reported to produce various central nervous system (CNS) effects and to be useful as a "ataractics, psychic energizers, and analgetics". 3-APBT has also been reported to have appetite suppressant effects in rodents, but to have considerably lower potency than AMT as an "analeptic" in rodents.

• Substituted benzothiophene

• Substituted tryptamine § Related compounds

• S-DMT

• 3-APB

• α-Methylisotryptamine (isoAMT)

• 1ZP2MA (indolizine analogue of AMT)

• 1Z2MAP1O (indolizine analogue of BK-NM-AMT)

• C-DMT

• 2-APBT

• 5-APBT

• 6-APBT

• 3-APBT - Isomer Design