β-Methylfentanyl

β-Methylfentanyl

Salts []
β-Methylfentanyl hydrochloride

Molecular structure via molpic based on CDK

Physical properties []
Molecular mass	350.5 g/mol ^[1]
Predicted LogP	4.4 ^[1]

Structural Identifiers []
Molecular formula	C₂₃H₃₀N₂O ^[1]
IUPAC name	N-phenyl-N-[1-(2-phenylpropyl)piperidin-4-yl]propanamide ^[1]
SMILES	CCC(=O)N(C1CCN(CC1)CC(C)C2=CC=CC=C2)C3=CC=CC=C3 ^[1]
InChI	InChI=1S/C23H30N2O/c1-3-23(26)25(21-12-8-5-9-13-21)22-14-16-24(17-15-22)18-19(2)20-10-6-4-7-11-20/h4-13,19,22H,3,14-18H2,1-2H3 ^[1]
InChIKey	UXIGUKSHASXDNI-UHFFFAOYSA-N ^[1]

β-Methylfentanyl (also known as Propanamide, N-phenyl-N-(1-(2-phenylpropyl)-4-piperidinyl)-, Propanamide, N-phenyl-N-[1-(2-phenylpropyl)-4-piperidinyl]-, N-phenyl-n-(1-(2-phenylpropyl)piperidin-4-yl)propanamide, βmethylfentanyl, β-Methyl fentanyl, Schembl15737353, DB09171, NS00072024, N-phenyl-n-(1-(2-phenylpropyl)-4-piperidinyl)propanamide or N-phenyl-n-(1-(2-phenylpropyl)piperidin-4-yl)propionamide) is a opioid substance of the phenethylpiperidine class.

Chemistry

Salts []

β-Methylfentanyl is typically found in the form of its hydrochloride salt.

Stereochemistry []

β-Methylfentanyl is a racemic mixture of the enantiomers.

Stereoisomerism
(R)-β-Methylfentanyl (S)-β-Methylfentanyl
Stereoisomer enumberation with rdkit

Subjective effects []

class / Opioid

Physical effects
Constipation Cough suppression Difficulty urinating Itchiness Nausea Pain relief Pupil constriction Respiratory depression Sedation Stomach cramp

Cognitive effects
Anxiety suppression Cognitive euphoria Compulsive redosing Increased music appreciation Thought deceleration

Visual effects
Double vision

Legal status []

United States: β-Methylfentanyl is a List of Schedule I drugs (US)|Schedule I substance.^[3]

External links []

References []

National Center for Biotechnology Information. PubChem Compound Summary for CID 6425761, β-Methylfentanyl. Accessed May 25, 2026. https://pubchem.ncbi.nlm.nih.gov/compound/6425761
U.S. Food and Drug Administration; National Center for Advancing Translational Sciences. β-Methylfentanyl. UNII: 9658A8O6GK. Global Substance Registration System. Accessed May 25, 2026. https://gsrs.ncats.nih.gov/ginas/app/beta/substances/9658A8O6GK
Schedules of Controlled Substances:Temporary Placement of Fentanyl-Related Substances in Schedule I. Temporary amendment; temporary scheduling order. Federal Register. February 1, 2018; 83(25):5188–92.

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