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Amino acids and derivatives

Alpha-methyldopa

Also known as Mulfasin, Metholes, LMethyldopa

CAS 55-40-3Formula C10H13NO4Molar mass 211.22 g/molEC 200-232-4
GHS signal word: Warning. Pictograms: Harmful or irritant 60 suppliers listed
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Alpha-methyldopa chemical structure, C10H13NO4, CAS 55-40-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
55-40-3
Formula
C10H13NO4
Molar mass
211.22 g/mol
EC number
200-232-4
HS code
292250
Category
Amino acids and derivatives

What is Alpha-methyldopa?

Plain description, key identifiers and synonyms

3-Hydroxy-alpha-methyl-DL-tyrosine is a member of benzenes and a monocarboxylic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-amino-3-(3,4-dihydroxyphenyl)-2-methylpropanoic acid
CAS number
55-40-3 CAS number cross-checkedOther or deprecated CAS: 555-29-3, 555-30-6
EC numbers
200-232-4, 209-088-7
Molecular formula
C10H13NO4
UNII
33TD13T99R
MDL number
MFCD00065917
InChIKey
CJCSPKMFHVPWAR-UHFFFAOYSA-N
InChI
InChI=1S/C10H13NO4/c1-10(11,9(14)15)5-6-2-3-7(12)8(13)4-6/h2-4,12-13H,5,11H2,1H3,(H,14,15)
SMILES (canonical and isomeric)
CC(CC1=CC(=C(C=C1)O)O)(C(=O)O)N

Synonyms

  • Mulfasin
  • Metholes
  • LMethyldopa
  • alphaMethylLdopa
  • LalphaMethyldopa
  • ()Methyldopa
  • L(alphaMd)
  • 3HydroxyalphamethylLtyrosine
  • alphaMethylL3,4dihydroxyphenylalanine
  • LalphaMethyl3,4dihydroxyphenylalanine
  • 3(3,4Dihydroxyphenyl)2methylLalanine
  • L()3(3,4Dihydroxyphenyl)2methylalanine
  • alphaMethylbeta(3,4dihydroxyphenyl)Lalanine
  • L()alphaMethylbeta(3,4dihydroxyphenyl)alanine
  • L()beta(3,4Dihydroxyphenyl)alphamethylalanine
  • L2Amino2methyl3(3,4dihydroxyphenyl)propionic acid
  • L2Amino3(3,4dihydroxyphenyl)2methylpropionic acid
  • alpha-Methyldopa (VAN)
  • 3-Hydroxy-alpha-methyl-DL-tyrosine
  • DL-Methyldopa
  • 3-Hydroxy-alpha-methyltyrosine
  • 2-amino-3-(3,4-dihydroxyphenyl)-2-methylpropanoic acid
  • (+/-)-methyldopa
  • Methyldopa (Racemic)
  • Tyrosine, 3-hydroxy-alpha-methyl-
Show all 38 synonyms
  • alpha-Methyl dopa
  • Methyldopa anhydrous, (+/-)-
  • L-(alpha-Md)
  • rac Alpha-Methyl DOPA
  • Dl-alpha-methyl dopa
  • alpha-Methyldopa, L-
  • Racemic alpha-methyldopa
  • Dopamethyperpax
  • Becanta
  • Grospisk
  • Medopal
  • (+/-)-3-(3,4-dihydroxyphenyl)-2-methyl-DL-alanine
  • L-alpha-Methyldopa

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
211.22 g/molcalc.
Exact mass
211.0845 Dacalc.
LogP (octanol/water)
0.44calc.
Topological polar surface area
103.8 Ųcalc.
Hydrogen bond donors
4calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
3calc.
Heavy atoms
15calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.3calc.
Formal charge
0calc.
Stereocentres
1calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
Precautionary statements (9)
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Alpha-methyldopa suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 60 suppliers
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Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

60 suppliers in 11 countries

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Alpha-methyldopa price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Alpha-methyldopa is traded under.

HS 2922.50Indicative HS code

Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function

World exports in 2024
$3.29B
−5.9% vs 2023, imports $3.19B
2019 to 2024
Top exporters
  1. China39.2%
  2. United Kingdom27.1%
  3. India * partner reported4.8%
Top importers
  1. United States20.7%
  2. Germany7.6%
  3. Italy6.6%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Alpha-methyldopa is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Alpha-methyldopa, based on the data on this page

What is Alpha-methyldopa?

3-Hydroxy-alpha-methyl-DL-tyrosine is a member of benzenes and a monocarboxylic acid.

What is the CAS number of Alpha-methyldopa?

The CAS registry number of Alpha-methyldopa is 55-40-3. Other or deprecated CAS numbers: 555-29-3, 555-30-6.

What is the molecular formula and weight of Alpha-methyldopa?

The molecular formula of Alpha-methyldopa is C10H13NO4 and its molar mass is 211.22 g/mol.

Is Alpha-methyldopa hazardous?

Alpha-methyldopa carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Alpha-methyldopa?

Alpha-methyldopa is usually classified under HS code 292250 (Amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Alpha-methyldopa?

CompoundList lists 60 suppliers of Alpha-methyldopa in United States, China, Germany, United Kingdom and 7 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Alpha-methyldopa?

Suppliers quote Alpha-methyldopa on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Alpha-methyldopa

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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