C4H4N2OS
128.15 g/mol
APIWarning
2-thiouracil
CAS141-90-2EC205-508-8
Category
API
Compound Class
Heterocycle
Primary Use
Pharmaceutical Raw Material
2-Thiouracil is a sulfur-containing heterocyclic compound used as a pharmaceutical raw material. It is primarily recognized as an antithyroid agent in pharmaceutical manufacturing and research.
pharmaceutical raw materialantithyroid agent
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 141-90-2
Related Compounds
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pharmaceutical raw material
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Deutivacaftor
CAS1413431-07-8
pharmaceutical raw material
Referencesame scaffold
5-Propyl-2-thiouracil
CAS2954-52-1
pharmaceutical intermediate
Referencesame scaffold
Propylthiouracil
CAS51-52-5
pharmaceutical raw material
Referencesame scaffold
Methylthiouracil
CAS56-04-2
pharmaceutical raw material
Safety Reference
Warning
H351Suspected of causing cancer
H303May be harmful if swallowed
H372Causes damage to organs through prolonged or repeated exposure
Regulatory Compliance1
- California Proposition 65USRegulation
Customs Tariff Classification
The international HS code for 2-thiouracil (CAS 141-90-2) is 2933.59.
HS code (international, 6-digit)
2933.59
EU CN code (8-digit)
2933 59 95
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
2-sulfanylidene-1H-pyrimidin-4-one
InChIKey
ZEMGGZBWXRYJHK-UHFFFAOYSA-N
SMILES
C1=CNC(=S)NC1=O
Synonyms (68)
- 2-TU
- T-3800
- TUL
- 2-Mercapto-4(1H)-pyrimidinone
- 2-Mercapto-4-pyrimidinol
- 2-Mercapto-4-pyrimidone
- 2-Mercaptopyrimid-4-one
- 2-Mercaptopyrimidin-4-ol
- 2-Sulfanyl-4-pyrimidinol #
- 2-Thio-1,3-pyrimidin-4-one
- 2-Thio-4-oxo-1,3-pyrimidine
- 2-Thio-4-oxypyrimidine
- 2-Thio-6-oxypyrimidine
- 2-Thiouracil (VAN)
- 2-Thiouracil, VETRANAL(TM)
- 2-mercaptopyrimidine-4-one
- 2-sulfanyl-1H-pyrimidin-6-one
- 2-sulfanylpyrimidin-4(3H)-one
- 2-sulfanylpyrimidin-4-ol
- 2-thio-4-pyrimidone
- 2-thiouracil
- 2-thioxo-1H-pyrimidin-4-one
- 4-Hydroxy-2-pyrimidinethiol
- 4-Hydroxypyrimidine-2-thiol
- 4-Pyrimidinol, 2-mercapto-
- 4-hydroxypyrimidinethione
- 6-Thiouracil
- 6-hydroxypyrimidine-2-thione
- AG-670/31547014
- Antagothyroid
- Antagothyroil
- Deracil
- Nobilen
- Pharmakon1600-01503973
- Thiouracil
- Tiouracyl
- Tiouracyl [Polish]
- Uracil, 2-thio-
- Uracil, 2-thio- (VAN)