3,3',5-Triiodothyropropionic acid

Also known as: Thyropropic acid, 3,3',5-Triiodothyropropionic acid, Triopron, Triprop, Atralose, Birodan, 4-(4-Hydroxy-3-iodophenoxy)-3,5-diiodohydrocinnamic acid, 4-(4-Hydroxy-3-iodophenoxy)-3,5-diiodobenzenepropanoic acid, 3-[4-(4-Hydroxy-3-iodophenoxy)-3,5-diiodophenyl]propanoic acid, Levothyroxine Impurity 17, Levothyroxine Impurity 22

3,3',5-Triiodothyropropionic acid (CAS 51-26-3) is a compound in the Organohalogen Compounds category listed in the Jingsj chemical database. It has the molecular formula C15H11I3O4 and a molecular weight of 635.95900 g/mol. Key properties include a melting point of 197-199ºC, a boiling point of 540.5ºCat 760 mmHg, a density of 2.367 g/cm3 and a flash point of 280.7ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 51-26-3
Jingsj CID: J-1605259-8
Molecular Formula: C₁₅H₁₁I₃O₄
Molecular Weight: 635.95900 g/mol
Category: Organohalogen Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	197-199ºC
Boiling Point	540.5ºCat 760 mmHg
Density	2.367 g/cm3
Flash Point	280.7ºC
Exact Mass	635.77900
PSA	66.76000
LogP	5.01550
Refractive Index	1.746

Customs & Trade Information

HS Code	2918990090
Summary	2918990090. other carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 3,3',5-Triiodothyropropionic acid?

The CAS number of 3,3',5-Triiodothyropropionic acid is 51-26-3.

What are the molecular formula and molecular weight of 3,3',5-Triiodothyropropionic acid?

3,3',5-Triiodothyropropionic acid has molecular formula C15H11I3O4 and molecular weight 635.95900 g/mol.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "3,3',5-Triiodothyropropionic acid (CAS 51-26-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1605259-8 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.