Anodyne

4-MTA

Salts []
Hydrochloride

Molecular structure via molpic based on CDK

Conformer []

Conformer structure via JSmol

Physical properties []
Molecular mass	181.30 g/mol ^[1]
Predicted LogP	2.3 ^[1]

Structural Identifiers []
Molecular formula	C₁₀H₁₅NS ^[1]
IUPAC name	1-(4-methylsulfanylphenyl)propan-2-amine ^[1]
SMILES	CC(CC1=CC=C(C=C1)SC)N ^[1]
InChI	InChI=1S/C10H15NS/c1-8(11)7-9-3-5-10(12-2)6-4-9/h3-6,8H,7,11H2,1-2H3 ^[1]
InChIKey	OLEWMKVPSUCNLG-UHFFFAOYSA-N ^[1]

4-Methylthioamphetamine

4-Methylthioamphetamine (also known as 4-MTA, p-Methylthioamphetamine, Benzeneethanamine, α-methyl-4-(methylthio)-, α-Methyl-p-(methylthio)phenethylamine, Flatliners, Golden eagle, P-1882, 4-Methylthioamphetamin, FLATLINERS or 2-Amino-1-(4-methylthiophenyl)propane) is a entactogen substance of the amphetamine class.

Chemistry

Salts []

4-Methylthioamphetamine is typically found in the form of its hydrochloride salt.

Stereochemistry []

4-Methylthioamphetamine is a racemic mixture of the enantiomers

Stereoisomers
(R)-4-Methylthioamphetamine (S)-4-Methylthioamphetamine

Subjective effects []

Physical effects
Increased libido Restless legs Shakiness Teeth grinding

Cognitive effects
Cognitive euphoria Disinhibition Empathy, effection, and sociability enhancement Increased music appreciation

External links []

References []

National Center for Biotechnology Information. PubChem Compound Summary for CID 151900, 4-Methylthioamphetamine. Accessed July 19, 2025. https://pubchem.ncbi.nlm.nih.gov/compound/151900
U.S. Food and Drug Administration; National Center for Advancing Translational Sciences. 4-Methylthioamphetamine. UNII: 6JP2T8KXTR. Global Substance Registration System. Accessed July 19, 2025. https://gsrs.ncats.nih.gov/ginas/app/beta/substances/6JP2T8KXTR