Harmaline

Modify Date: 2026-07-05 16:38:55

Harmaline Structure
Harmaline structure
Common Name Harmaline
CAS Number 304-21-2 Molecular Weight 214.263
Density 1.3±0.1 g/cm3 Boiling Point 426.4±45.0 °C at 760 mmHg
Molecular Formula C13H14N2O Melting Point 232-234 °C(lit.)
MSDS Chinese USA Flash Point 211.7±28.7 °C

 Use of Harmaline


Harmaline is a potent and reversible monoamine oxidase inhibitor in vivo. Harmaline is a central nervous system stimulant and can be used to induce tremor in rodents.

 Names

This table lists Chinese names, IUPAC names and various aliases of this chemical substance.

Name harmaline
Synonym More Synonyms

 Harmaline Biological Activity

This table contains bioactivity, target information and biological‑assay experimental data of this compound.

Description Harmaline is a potent and reversible monoamine oxidase inhibitor in vivo. Harmaline is a central nervous system stimulant and can be used to induce tremor in rodents.
Related Catalog
Target

Target: Monoamine oxidase[1]

In Vitro Harmaline inhibits monoamine oxidases, thus increasing the levels of monoamine neurotransmitters (e.g., at 7-70 μM/kg in rats)[1]. Harmaline-induced tremor in rodents is a model of essential tremor. The tremor activity is dependent on harmaline dose. The first-line clinical essential tremor treatments propranolol, primidone and gabapentin and γ-hydroxybutyrate (GHB) significantly attenuate harmaline-induced tremor. The anticonvulsants valproate and carbamazepine and the mood stabilizer lithium suppress harmaline-induced tremor. The γ-amino-butyric acid (GABA) receptor subtype A receptor agonist muscimol attenuate harmaline-induced tremor. Harmaline (30 mg/kg) induces tremor in mice through the N-methyl-D-aspartate (NMDA) receptor, both competitive and non-competitive NMDA receptor antagonists, and AMPA receptor blockade, decreased harmaline-induced tremor[2].
Animal Admin Rats[1] Wistar albino rats of 160 to 190 g, fasted for 16 hr, receive various doses of Harmaline (0-70 μM/kg) either alone or 1 hr prior to subcutaneous administration of 75 mg/kg 5-hydroxytryptophan, 10 mg/kg Ro 4-1284 or 100 mg/kg iproniazid. The animals are decapitated and the 5-hydroxytryptamine of the brain (in the experiments with 5-hydroxytryptophan also of the heart) is measured spectrophotofluorometrically[1]. Mice[2] Group-housed mice are brought to the experimental room for at least 1 h to acclimate prior to testing. Following a 20 min pretreatment with vehicle or test compounds (60 min for primidone), drug-naive mice are injected with harmaline (30 mg/kg) and placed inside the Tremor Monitor chamber for a 10 min habituation period. Following the habituation period, tremor activity of the mice is measured for 8 min[2].
References

[1]. Gey, K.F, et al. Effect of α-alkylated tryptamine derivatives on 5-hydroxytryptamine metabolism in vivo. Brit.J.Pharmacol. 19, 161-167(1962).

[2]. Paterson NE, et al. Pharmacological characterization of harmaline-induced tremor activity in mice. Eur J Pharmacol. 2009 Aug 15;616(1-3):73-80.

 Chemical & Physical Properties

This table shows physicochemical parameters including melting point, boiling point, density, solubility and optical rotation. Missing data is marked as N/A.

Density 1.3±0.1 g/cm3
Boiling Point 426.4±45.0 °C at 760 mmHg
Melting Point 232-234 °C(lit.)
Molecular Formula C13H14N2O
Molecular Weight 214.263
Flash Point 211.7±28.7 °C
Exact Mass 214.110611
PSA 37.38000
LogP 0.66
Vapour Pressure 0.0±1.0 mmHg at 25°C
Index of Refraction 1.647
InChIKey RERZNCLIYCABFS-UHFFFAOYSA-N
SMILES COc1ccc2c3c([nH]c2c1)C(C)=NCC3

 MSDS

This table provides MSDS information including hazard classification, first‑aid, fire‑fighting, spill handling, operation and storage instructions.

 Toxicological Information

This table summarizes toxicological test data, acute & chronic toxicity and ecological hazard parameters for this chemical.

CHEMICAL IDENTIFICATION

RTECS NUMBER :
UU9800000
CHEMICAL NAME :
3H-Pyrido(3,4-b)indole, 4,9-dihydro-7-methoxy-1-methyl-
CAS REGISTRY NUMBER :
304-21-2
BEILSTEIN REFERENCE NO. :
0207310
LAST UPDATED :
199612
DATA ITEMS CITED :
5
MOLECULAR FORMULA :
C13-H14-N2-O
MOLECULAR WEIGHT :
214.29
WISWESSER LINE NOTATION :
T B656 DM HM CHJ F1 KO1

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
120 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
VHTODE Veterinary and Human Toxicology. (American College of Veterinary and Comparative Toxicology, Publication Office, Comparative Toxicology, Manhattan, KS 66506) V.19- 1977- Volume(issue)/page/year: 33,276,1991
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
120 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
PSCBAY Psychopharmacology Service Center, Bulletin. (Bethesda, MD) V.1-3, 1961-65. For publisher information, see PSYBB9. Volume(issue)/page/year: 2,17,1963
TYPE OF TEST :
LDLo - Lowest published lethal dose
ROUTE OF EXPOSURE :
Intravenous
SPECIES OBSERVED :
Rodent - rabbit
DOSE/DURATION :
20 mg/kg
TOXIC EFFECTS :
Sense Organs and Special Senses (Eye) - mydriasis (pupillary dilation) Behavioral - excitement Behavioral - ataxia
REFERENCE :
NEPHBW Neuropharmacology. (Pergamon Press Ltd., Headington Hill Hall, Oxford OX3 OBW, UK) V.9- 1970- Volume(issue)/page/year: 10,15,1971 *** REVIEWS *** TOXICOLOGY REVIEW PISDDJ Pacific Information Service on Street Drugs. (J.K. Brown, School of Pharmacy, Univ. of the Pacific, Stockton, CA 95211) V.1- 1972(?)- Volume(issue)/page/year: 5(3-6),-,1977 TOXICOLOGY REVIEW CTOXAO Clinical Toxicology. (New York, NY) V.1-18, 1968-81. For publisher information, see JTCTDW. Volume(issue)/page/year: 12,1,1978

 Safety Information

This table covers safety warnings, protective measures, incompatible substances and disposal guidelines for this compound.

Personal Protective Equipment Eyeshields;Gloves;type N95 (US);type P1 (EN143) respirator filter
Hazard Codes Xn
Risk Phrases R25
Safety Phrases S22-S24/25
RIDADR 1544
WGK Germany 3
RTECS UU9800000
Packaging Group III
Hazard Class 6.1(b)
HS Code 2933990090

 Synthetic Route

This table presents publicly reported synthetic routes, reaction conditions, reactants and product information of the compound.

~%

Harmaline Structure

Harmaline

CAS#:304-21-2

Learn More
Literature: Chemische Berichte, , vol. 63, p. 120,123

~%

Harmaline Structure

Harmaline

CAS#:304-21-2

Learn More
Literature: Canadian Journal of Chemistry, , vol. 37, p. 1851,1856

~%

Harmaline Structure

Harmaline

CAS#:304-21-2

Learn More
Literature: Canadian Journal of Chemistry, , vol. 37, p. 1851,1856

~%

Harmaline Structure

Harmaline

CAS#:304-21-2

Learn More
Literature: Chem. Zentralbl., , vol. 72, # I p. 958 Justus Liebigs Annalen der Chemie, , vol. 64, p. 365 Chemische Berichte, , vol. 18, p. 402 Chemische Berichte, , vol. 30, p. 2482

~%

Harmaline Structure

Harmaline

CAS#:304-21-2

Learn More
Literature: Chemische Berichte, , vol. 63, p. 120,123

 Customs

This table shows customs‑related data including HS‑code, tariff and regulatory conditions for import and export.

HS Code 2933990090
Summary 2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

 Articles34

More Articles

This table lists relevant public references with title, journal and publication metadata for this compound.

High-throughput screening for new psychoactive substances (NPS) in whole blood by DLLME extraction and UHPLC-MS/MS analysis.

J. Chromatogr. B. Analyt. Technol. Biomed. Life Sci. 1000 , 57-68, (2015)

The increasing number of new psychoactive substances (NPS) present in the illicit market render their identification in biological fluids/tissues of great concern for clinical and forensic toxicology....

Fast determination of harmala alkaloids in edible algae by capillary electrophoresis mass spectrometry.

Anal. Bioanal. Chem 407(13) , 3637-45, (2015)

The use of algae as a foodstuff is rapidly expanding worldwide from the East Asian countries, where they are also used for medical care. Harmala alkaloids (HAlk) are a family of bioactive compounds fo...

Rapid and sensitive detection of the inhibitive activities of acetyl- and butyryl-cholinesterases inhibitors by UPLC-ESI-MS/MS.

J. Pharm. Biomed. Anal. 94 , 215-20, (2014)

Acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) are legitimate therapeutic targets for Alzheimer's disease. The classical approach for screening potential AChE/BChE inhibitors was develop...

 HarmalineBioassay

View more

This table contains target information, in‑vitro & in‑vivo assay data for this compound.

Name: Luminescence-based cell-based primary high throughput screening assay to identify ago...
Source: The Scripps Research Institute Molecular Screening Center
Target: mu-type opioid receptor isoform MOR-1 [Homo sapiens]
External Id: OPRM1-OPRD1_AG_LUMI_1536_1X%ACT PRUN
Name: Fluorescence-based cell-based primary high throughput screening assay to identify ago...
Source: The Scripps Research Institute Molecular Screening Center
Target: muscarinic acetylcholine receptor M1 [Homo sapiens]
External Id: CHRM1_AG_FLUO8_1536_1X%ACT PRUN
Name: Antimicrobial activity against promastigote stage of Leishmania donovani after 72 hrs...
Source: ChEMBL
Target: Leishmania donovani
External Id: CHEMBL3367772
Name: Antimicrobial activity against axenic amastigote stage of Leishmania donovani after 7...
Source: ChEMBL
Target: Leishmania donovani
External Id: CHEMBL3367773
Name: Fluorescence-based cell-based primary high throughput screening assay to identify pos...
Source: The Scripps Research Institute Molecular Screening Center
Target: muscarinic acetylcholine receptor M1 [Homo sapiens]
External Id: CHRM1_PAM_FLUO8_1536_1X%ACT PRUN
Name: Fluorescence polarization-based biochemical high throughput primary assay to identify...
Source: The Scripps Research Institute Molecular Screening Center
Target: RecName: Full=Sialate O-acetylesterase; AltName: Full=H-Lse; AltName: Full=Sialic acid-specific 9-O-acetylesterase; Flags: Precursor [Homo sapiens]
External Id: SIAE_INH_FP_1536_1X%INH PRUN
Name: Displacement of [3H]flunitrazepam from GABAA (unknown origin ) receptor by radioligan...
Source: ChEMBL
Target: Gamma-aminobutyric acid receptor subunit gamma-2
External Id: CHEMBL5235566
Name: MITF Measured in Cell-Based System Using Plate Reader - 2084-01_Activator_SinglePoint...
Source: Broad Institute
Target: N/A
External Id: 2084-01_Activator_SinglePoint_HTS_Activity
Name: Counterscreen for inhibitors of the fructose-bisphosphate aldolase (FBA) of M. tuberc...
Source: The Scripps Research Institute Molecular Screening Center
Target: N/A
External Id: GDH-TPI_INH_ABS_1536_1X%INH CSRUN
Name: Primary high throughput screening by co-culture imaging for identification hits as a ...
Source: 23209
Target: N/A
External Id: UIHTS20180925
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 Synonyms

This table collects all English aliases, systematic names and CAS‑related synonyms of the compound.

3,4-Dihydroharmine
Armalin
3,4-Dihydro-7-methoxy-1-methyl-9H-pyrido[3,4-b]indole
7-Methoxy-1-methyl-3,4-dihydro-2H-β-carboline
Harmine,dihydro
7-methoxy-1-methyl-3,4-dihydro-2H-pyrido[3,4-b]indole
Harmalol methyl ether
EINECS 206-152-6
MFCD00004955
3,4-Dihydro-7-methoxy-1-methyl-β-carboline
Dihydroharmine
Harmidine
O-Methylharmalol

 Harmaline | FAQ

This section contains frequently‑asked‑questions about this compound, including basic parameters, properties, storage conditions and corresponding answers.

Q: What are the upstream materials of harmaline?
A: Related upstream materials(CAS) of harmaline: 22375-73-1;106275-52-9;3610-36-4;442-51-3;56-23-5.
Q: What are the uses of harmaline?
A: Main uses of harmaline: Harmaline is a potent and reversible monoamine oxidase inhibitor in vivo. Harmaline is a central nervous system stimulant and can be used to induce tremor in rodents.
Q: What is the safety information for harmaline?
A: Safety information for harmaline: S22-S24/25.
Q: What is the polar surface area (PSA) of harmaline?
A: Polar surface area (PSA) of harmaline is 37.38000.
Q: What is the molecular weight of harmaline?
A: Molecular weight of harmaline is 214.263.
Q: What is the molecular formula of harmaline?
A: Molecular formula of harmaline is C13H14N2O.
Q: What are the downstream products of harmaline?
A: Related downstream products(CAS) of harmaline: 487-03-6;442-51-3;89-41-8;58795-15-6;525-57-5;77784-76-0;77784-77-1;486-93-1.
Q: What is the CAS number of harmaline?
A: CAS number of harmaline is 304-21-2.
Q: What is the LogP of harmaline?
A: LogP of harmaline is 0.66.
Q: What is the boiling point of harmaline?
A: Boiling point of harmaline is 426.4±45.0 °C at 760 mmHg.

 Harmalinefactory

This table lists manufacturers and suppliers of this compound, including vendor names and product supply reference information.

Shanghai Nianxing Industrial Co., Ltd
BioBioPha
naturewill
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