CompoundList
Sign in
Cardiovascular and metabolic drugs

Thiouracil

Also known as 2-thiouracil, Deracil, Antagothyroid

CAS 141-90-2Formula C4H4N2OSMolar mass 128.16 g/molEC 205-508-8
GHS signal word: Warning. Pictograms: Serious health hazard 110 suppliers listed
Get quotes Compare 110 suppliers
Thiouracil chemical structure, C4H4N2OS, CAS 141-90-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Minute crystals, prisms, or white or pale cream-colored powder
Melting point
Ca. 340
Solubility
VERY SLIGHTLY SOL IN WATER (1:2000), PRACTICALLY INSOL IN ETHER, ACIDS, READILY SOL IN A…
HS code
293359
Category
Cardiovascular and metabolic drugs
Illustrative photo, fine white powder in an amber glass reagent bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Thiouracil?

Plain description, key identifiers and synonyms

Thiouracil is a nucleobase analogue that is uracil in which the oxo group at C-2 is replaced by a thioxo group. It has a role as a metabolite and an antithyroid drug. It is a thiocarbonyl compound and a nucleobase analogue. It is functionally related to a uracil.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-sulfanylidene-1H-pyrimidin-4-one
CAS number
141-90-2 CAS number cross-checkedOther or deprecated CAS: 124700-71-6, 124700-72-7, 125220-28-2, 126160-72-3, 156-82-1, 80275-68-9
EC number
205-508-8
Molecular formula
C4H4N2OS
UNII
59X161SCYL
MDL number
MFCD00006039, MFCD00044203
InChIKey
ZEMGGZBWXRYJHK-UHFFFAOYSA-N
InChI
InChI=1S/C4H4N2OS/c7-3-1-2-5-4(8)6-3/h1-2H,(H2,5,6,7,8)
SMILES (canonical and isomeric)
C1=CNC(=S)NC1=O

Synonyms

  • 2-thiouracil
  • Deracil
  • Antagothyroid
  • Antagothyroil
  • Nobilen
  • 2-thioxo-2,3-dihydropyrimidin-4(1H)-one
  • 2-Mercapto-4-hydroxypyrimidine
  • 2-Mercapto-4-pyrimidone
  • 4(1H)-Pyrimidinone, 2,3-dihydro-2-thioxo-
  • 6-Thiouracil
  • 2-Mercapto-4-pyrimidinol
  • Uracil, 2-thio-
  • 2-sulfanylidene-1H-pyrimidin-4-one
  • 4-Hydroxy-2-pyrimidinethiol
  • 2,3-Dihydro-2-thioxo-4(1H)-pyrimidinone
  • 6-Hydroxy-2-mercaptopyrimidine
  • 2-Thio-1,3-pyrimidin-4-one
  • 2-Mercapto-4(1H)-pyrimidinone
  • 4-Hydroxy-2(1H)-pyrimidinethione
  • 2-Thio-4-oxypyrimidine
  • 2-Thio-2,4-(1H,3H)-pyrimidinedione
  • 2-Thio-4-oxo-1,3-pyrimidine
  • 2-Mercaptopyrimidin-4-ol
  • 4-Hydroxy-2-mercaptopyrimidine
  • 4-Pyrimidinol, 2-mercapto-
Show all 36 synonyms
  • 2-sulfanylpyrimidin-4-ol
  • Tiouracyl
  • 4-hydroxypyrimidine-2(1H)-thione
  • 4(3H)-Pyrimidinone, 2-mercapto- (9CI)
  • Uracil, 2-thio- (VAN)
  • TU
  • 2(1H)-Pyrimidinethione, 6-hydroxy- (9CI)
  • 2-Mercaptopyrimid-4-one
  • 2-mercaptopyrimidine-4-one
  • 2-Mercapto-pyrimidin-4-ol
  • 2-Thioxo-2,3-dihydro-1H-pyrimidin-4-one

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

Appearance
Minute crystals, prisms, or white or pale cream-colored powderexp.
Odour
ODORLESSexp.
Taste
BITTER TASTEexp.
Melting point
Ca. 340exp.
Solubility
VERY SLIGHTLY SOL IN WATER (1:2000), PRACTICALLY INSOL IN ETHER, ACIDS, READILY SOL IN ALKALINE SOLNexp.

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
128.16 g/molcalc.
Exact mass
128.0044 Dacalc.
LogP (octanol/water)
0.43calc.
Topological polar surface area
48.65 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
8calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
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, O=c1cc[nH]c(=S)[nH]1

O=c1cc[nH]c(=S)[nH]1

1 ring, 8 atoms. This chemical is the scaffold itself.

260 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H351Suspected of causing cancer.
Precautionary statements (5)
  • P203Obtain, read and follow all safety instructions before use.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P318If exposed or concerned, get medical advice.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

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

Thiouracil suppliers

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

All 110 suppliers
30 of 30 offers

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

110 suppliers in 16 countries

Send one request to many suppliers

Choose up to 10 suppliers or let us match your request. Compare quotes side by side, free.

Choose suppliersPost a request

Thiouracil 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.

Get latest price

Uses and applications

What the substance is used for, by industry and function

Chemical intermediate for iothiouracil sodium- an antithyroid agent.

Veterinary medication:.

Pharmacological actions

  • Antithyroid Agents
  • Vasodilator Agents

Roles

  • antagonist
  • antithyroid drug
  • hormone antagonist
  • hormone receptor modulator
  • metabolite
  • pharmaceutical
  • receptor modulator

Pharmacology

Thiouracil is a sulfur-containing uracil. An established antithyroid drug and highly selective inhibitor of nitric oxide synthase (NOS), thiouracil also covalently binds to dopaquinone, produced by tyrosinase catalyzed oxidation of tyrosine, thereby selectively accumulating in de novo-synthesized melanin in overactive melanin-producing cells and providing a means to localize melanoma cells. (NCI04)

How it is made

Condensation of ethyl formylacetate with thiourea

Prepd by condensing ethyl formylacetate with thiourea: wheeler, liddle, am chem j 40, 550 (1908).

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Thiouracil is traded under.

HS 2933.59Indicative HS code

Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring, other

World exports in 2024
$18.4B
+10.5% vs 2023, imports $24.8B
2019 to 2024
Top exporters
  1. Ireland43.6%
  2. Switzerland * partner reported26.3%
  3. China7.9%
Top importers
  1. Slovenia30.3%
  2. United States30.1%
  3. Germany15.3%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Thiouracil, based on the data on this page

What is Thiouracil?

Thiouracil is a nucleobase analogue that is uracil in which the oxo group at C-2 is replaced by a thioxo group. It has a role as a metabolite and an antithyroid drug. It is a thiocarbonyl compound and a nucleobase analogue. It is functionally related to a uracil.

What is the CAS number of Thiouracil?

The CAS registry number of Thiouracil is 141-90-2. Other or deprecated CAS numbers: 124700-71-6, 124700-72-7, 125220-28-2.

What is the molecular formula and weight of Thiouracil?

The molecular formula of Thiouracil is C4H4N2OS and its molar mass is 128.16 g/mol.

What is Thiouracil used for?

Chemical intermediate for iothiouracil sodium- an antithyroid agent. Veterinary medication:.

Is Thiouracil hazardous?

Thiouracil carries the GHS signal word "Warning". Main hazards: suspected of causing cancer. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Thiouracil?

Thiouracil is usually classified under HS code 293359 (Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Thiouracil?

CompoundList lists 110 suppliers of Thiouracil in China, United States, Germany, United Kingdom and 12 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Thiouracil in India?

3 suppliers in India list Thiouracil on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Thiouracil?

Suppliers quote Thiouracil 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 Thiouracil

Get quotes for Thiouracil

Post one free request with your grade, quantity and destination. Matching suppliers send quotes you can compare side by side.
Post a request Sell Thiouracil
Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
Embed this structure on your websiteShow code

Paste this code into your page to show the 2D structure of Thiouracil with a 3D view, its CAS number and a link back to this page. Free to use with the link kept.

<iframe src="https://www.compoundlist.com/embed/structure/thiouracil-141-90-2" title="Thiouracil structure on CompoundList" width="360" height="420" style="border:1px solid #E7E2DA;border-radius:12px;max-width:100%" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
Preview the embed

Explore more in Cardiovascular and metabolic drugs or HS code 293359

110 suppliers
Free quotes, contact stays private
Get quotes