Liothyronine

Also known as: 3,3',5-Triiodo-L-thyronine, 3,5,3'-Triiodo-L-thyronine, O-(4-Hydroxy-3-iodophenyl)-3,5-diiodo-L-tyrosine, Cytomel, L-Triiodothyronine, T3, NSC 80203, (2S)-2-Amino-3-[4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl]propanoic acid, L-3-[4-(4-Hydroxy-3-iodophenoxy)-3,5-diiodophenyl]alanine

Liothyronine (CAS 6893-02-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C15H12I3NO4 and a molecular weight of 650.974 g/mol. Key properties include a melting point of 234-238 °C(lit.), a boiling point of 563.5±50.0 °C at 760 mmHg, a density of 2.4±0.1 g/cm3 and a flash point of 294.6±30.1 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H301 — Toxic if swallowed and H311 — Toxic in contact with skin. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 6893-02-3
Jingsj CID: J-34426-9
Molecular Formula: C₁₅H₁₂I₃NO₄
Molecular Weight: 650.974 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	234-238 °C(lit.)
Boiling Point	563.5±50.0 °C at 760 mmHg
Density	2.4±0.1 g/cm3
Flash Point	294.6±30.1 °C
Exact Mass	650.790039
PSA	92.78000
LogP	5.08
Vapor Pressure	0.0±1.6 mmHg at 25°C
Refractive Index	1.763

GHS Safety & Compliance

Flammable / Acute Toxicity / Health HazardSignal word: Danger

H225 — Highly flammable liquid and vapour
H301 — Toxic if swallowed
H311 — Toxic in contact with skin
H331 — Toxic if inhaled
H370 — Causes damage to organs

Activity & Biological Data

Target	Human Endogenous Metabolite
Additional Information	[1]. Lin KH, et al. Stimulation of proliferation by 3,3',5-triiodo-L-thyronine in poorly differentiated human hepatocarcinoma cells overexpressing beta 1 thyroid hormone receptor. Cancer Lett. 1994 Oct 14;85(2):189-94. [2]. Bhat MK, et al. Conformational changes of human beta 1 thyroid hormone receptor induced by binding of 3,3',5-triiodo-L-thyronine. Biochem Biophys Res Commun. 1993 Aug 31;195(1):385-92.

Target

Human Endogenous Metabolite

Additional Information

[1]. Lin KH, et al. Stimulation of proliferation by 3,3',5-triiodo-L-thyronine in poorly differentiated human hepatocarcinoma cells overexpressing beta 1 thyroid hormone receptor. Cancer Lett. 1994 Oct 14;85(2):189-94. [2]. Bhat MK, et al. Conformational changes of human beta 1 thyroid hormone receptor induced by binding of 3,3',5-triiodo-L-thyronine. Biochem Biophys Res Commun. 1993 Aug 31;195(1):385-92.

Customs & Trade Information

HS Code	2922509090
Summary	2922509090. other amino-alcohol-phenols, amino-acid-phenols and other amino-compounds with oxygen function. 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 Liothyronine?

The CAS number of Liothyronine is 6893-02-3.

What are the molecular formula and molecular weight of Liothyronine?

Liothyronine has molecular formula C15H12I3NO4 and molecular weight 650.974 g/mol.

Is Liothyronine hazardous?

Liothyronine has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H301 — Toxic if swallowed; H311 — Toxic in contact with skin.

What are the upstream and downstream products of Liothyronine?

For Liothyronine, Upstream Products: 3,5-Diiodo-L-thyronine.

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. "Liothyronine (CAS 6893-02-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-34426-9 (accessed 2026-11-06).

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