Molekula
L-Thyroxine
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
L-Thyroxine is a synthetic thyroid hormone used in the treatment of hypothyroidism and thyroid cancer. It is a key compound in regulating metabolism and is available in various forms for medical and research applications. CAS: 51-48-9, Molecular Formula: C15H11I4NO4, Molecular Weight: 776.87 g/mol, Storage: Ambient, Signal Word: Danger. Molekula supplies L-Thyroxine from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 g — £35.80 per pack ex VAT · £42.96 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Off-white to cream coloured powder |
| Specific rotation | -6.0 - -5.0° |
| Loss on Drying | 0.0 to 11.0 % |
| Purity | 98.0 -102.0 % |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Needles |
| Melting Point | 235.5 °C |
| Water Solubility | Slightly soluble in water |
Source: PubChem CID 5819 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 25797978 |
| CAS Number | 51-48-9 |
| IUPAC Name | (2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoic acid |
| EC Number | 200-101-1 |
| Molecular Formula | C15H11I4NO4 |
| Molecular Weight | 776.87 |
| Exact Mass | 776.6867 |
| SMILES | C1=C(C=C(C(=C1I)OC2=CC(=C(C(=C2)I)O)I)I)C[C@@H](C(=O)O)N |
| InChIKey | XUIIKFGFIJCVMT-LBPRGKRZSA-N |
| InChI | InChI=1S/C15H11I4NO4/c16-8-4-7(5-9(17)13(8)21)24-14-10(18)1-6(2-11(14)19)3-12(20)15(22)23/h1-2,4-5,12,21H,3,20H2,(H,22,23)/t12-/m0/s1 |
| PubChem CID | 5819 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29379045 |
| Tariff Code | 2937900000 |
Safety & GHS
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- H302 Harmful if swallowed
- H370 Causes damage to organs
- H372 Causes damage to organs through prolonged or repeated exposure
Precautionary statements
- P202 Do not handle until all safety precautions have been read and understood
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 2-amino-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic acid
- L Thyrox
- L Thyroxin beta
- L Thyroxin Henning
- L Thyroxine Roche
- L-3,5,5'-tetraiodothyronine
- Levothyroxin Delalande
- thyroxin
- thyroxine
- Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-
Frequently asked questions
What is L-Thyroxine used for?
L-Thyroxine is primarily used in the treatment of hypothyroidism and thyroid cancer. It is also used in research and diagnostic applications.
What is the chemical formula and molecular weight of L-Thyroxine?
The formula is C15H11I4NO4 with a molecular weight of 776.87 g/mol.
How should L-Thyroxine be stored?
Store at ambient temperature, protected from light and moisture.
What grade of L-Thyroxine does Molekula supply?
Molekula supplies L-Thyroxine in research grade.
Can Molekula supply L-Thyroxine in bulk?
Yes, Molekula can supply L-Thyroxine in bulk quantities—please contact us for pricing and availability.
What documentation comes with an order of L-Thyroxine?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.