3,4-Dihydroxy-L-phenylalanine
3,4-Dihydroxy-L-phenylalanine (CAS: 59-92-7), also known as L-DOPA, is a crucial biomolecule with the molecular formula C9H11NO4 and a molecular weight of 197.19 g/mol. As a naturally occurring amino acid and a precursor to dopamine, it plays a vital role in neurotransmission. This compound is extensively used in biochemical research and as a key intermediate in the synthesis of various active pharmaceutical ingredients.
- IUPAC
- 3-(3,4-Dihydroxyphenyl)-L-alanine,L-3-Hydroxytyrosine,L-DOPA,Levodopa
- Synonyms
- (HO)2C6H3CH2CH(NH2)CO2H3-(3,4-Dihydroxyphenyl)-L-alanineL-3-HydroxytyrosineL-DOPALevodopa

Neuroscience Research
L-DOPA is a fundamental tool in neuroscience for studying dopaminergic pathways and neurotransmitter synthesis. Its role as a precursor to dopamine makes it invaluable for investigating neurological disorders and their mechanisms.
Pharmaceutical Intermediate
It serves as a critical building block in the synthesis of various pharmaceutical agents. Its chemical structure allows for derivatisation into complex molecules with therapeutic properties.
Biochemical Studies
Used in biochemical research to explore metabolic pathways, enzyme kinetics, and the role of catecholamines in cellular processes. Its biological activity makes it a subject of extensive study.
| Molecular weight | 197.19 |
|---|---|
| Linear formula | (HO)2C6H3CH2CH(NH2)CO2H |
| Assay | ≥99.0% (NT) |
| Optical activity | [α]20/D −12±1°, c = 1% in 1 M HCl |
| Melting point | 276-278 °C(lit.) |

Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 3,4-Dihydroxy-L-phenylalanine used for?
+
3,4-Dihydroxy-L-phenylalanine (L-DOPA) is primarily used in neuroscience research for studying dopaminergic pathways and in the pharmaceutical industry as an intermediate for synthesizing active pharmaceutical ingredients.
What is the CAS number and formula for 3,4-Dihydroxy-L-phenylalanine?
+
The CAS number is 59-92-7, and the linear formula is (HO)2C6H3CH2CH(NH2)CO2H.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies 3,4-Dihydroxy-L-phenylalanine with a purity of ≥99.0% (NT). We do not represent this product as USP, BP, or EP grade.
How should 3,4-Dihydroxy-L-phenylalanine be handled safely?
+
Handle with appropriate personal protective equipment, including a dust mask (N95 US), eyeshields, and gloves. Avoid breathing dust, and ensure adequate ventilation. Refer to the Safety Data Sheet for comprehensive handling information, as it may cause respiratory irritation (H335), skin irritation (H315), and serious eye irritation (H319).
How is 3,4-Dihydroxy-L-phenylalanine packed and shipped?
+
This chemical is typically packed in compliance with international shipping regulations. TSS offers global supply and export services for this product.
How can I request a sample or quote for 3,4-Dihydroxy-L-phenylalanine?
+
To request a sample or quote, please contact our sales department through the website or by calling us directly. Our team will assist you with your inquiry.
▶ Related products

1-(2-Fluorobenzyl)piperazine
C11H15FN2
Chemical Synthesis
1-(2-Fluorophenyl)biguanide hydrochloride
Chemical Synthesis

1-(2-Fluorophenyl)cyclopropanecarboxylic acid
C10H9FO2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine
C10H13FN2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine monohydrochloride
C10H13FN2 · HCl
Chemical Synthesis
1-(2-Furoyl)-1H-benzotriazole
C11H7N3O2
Chemical Synthesis
1-(2-Furoyl)piperazine
C9H12N2O2
Chemical Synthesis
1-(2-Hydroxy-5-methylphenyl)-3-phenyl-1,3-propanedione
Chemical Synthesis
▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis