C7H10N2OS
170.23 g/mol
APIWarning
Propylthiouracil
CAS51-52-5EC200-103-2
Category
API
Compound Class
Heterocycle
Primary Use
Pharmaceutical Raw Material
Propylthiouracil is a pharmaceutical raw material used in the manufacture of thyroid-inhibiting medications. It is a sulfur-containing heterocyclic compound with moderate lipophilicity and two hydrogen-bond donor sites.
pharmaceutical manufacturingresearch reagent for thyroid studies
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 51-52-5
Related Compounds
ReferenceSame Category
(±)-hyoscyamine
CAS51-55-8
pharmaceutical raw material
ReferenceSame Category
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CAS51-56-9
pharmaceutical raw material
ReferenceSame Category
Neostigmine methylsulfate
CAS51-60-5
pharmaceutical raw material
ReferenceSame Category
Dopamine
CAS51-61-6
pharmaceutical raw material
Referencesame scaffold
Methylthiouracil
CAS56-04-2
pharmaceutical raw material
Referencesame scaffold
4-Hydroxy-5-methyl-2-mercaptopyrimidine
CAS636-26-0
pharmaceutical intermediate
Referencesame scaffold
4-Amino-6-hydroxy-2-mercaptopyrimidine monohydrate
CAS65802-56-4
research compound
Referencesame scaffold
2-Thiouracil
CAS141-90-2
pharmaceutical raw material
Safety Reference
Warning
H302Harmful if swallowed
H351Suspected of causing cancer
H350May cause cancer
H361Suspected of damaging fertility or the unborn child
H372Causes damage to organs through prolonged or repeated exposure
Regulatory Compliance1
- California Proposition 65USRegulation
Customs Tariff Classification
The international HS code for Propylthiouracil (CAS 51-52-5) 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
6-propyl-2-sulfanylidene-1H-pyrimidin-4-one
InChIKey
KNAHARQHSZJURB-UHFFFAOYSA-N
SMILES
CCCC1=CC(=O)NC(=S)N1
Synonyms (71)
- 3CJ
- Propiltiouracilo [INN-Spanish]
- Propylthiouracil (JP18/USP/INN)
- Propylthiouracil, European Pharmacopoeia (EP)
- Propylthiouracil, United States Pharmacopeia (USP)
- Propylthiouracile [INN-French]
- Propylthiouracilum [INN-Latin]
- 4-Propyl-2-thiouracil
- 6-N-Propyl-2-thiouracil
- 6-N-Propylthiouracil
- 6-Propil-tiouracile
- 6-Propil-tiouracile [Italian]
- 6-Propyl-2-thiouracil
- 6-Propylthiouracil
- 6-Thio-4-propyluracil
- PROPYLTHIOURACIL [MART.]
- PTU (thyreostatic)
- Procasil
- Propacil
- Propilthiouracil
- Propiltiouracile
- Propiltiouracilo
- Propycil
- Propyl-Thiorist
- Propyl-Thiorit
- Propyl-Thyracil
- Propylthiouracil (Standard)
- Propylthiouracil CRS
- Propylthiouracil RS
- Propylthiouracile
- Propylthiouracilum
- Propythiouracil
- Prothiucil
- Prothiurone
- Prothycil
- Prothyran
- Protiural
- Thiuragyl
- Thyreostat II
- Uracil, 6-propyl-2-thio-
- propylthiouracil