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API Reference Standards

Levothyroxine WS

Reference StandardIn stock

Levothyroxine WS (CAS 51-48-9) supplier Zemixal. Lab and bulk packs, batch COA, fast global delivery. Part of our API Reference Standards range.

Pack sizes
Levothyroxine WS chemical structure
CAS number51-48-9
FormulaC15H11I4NO4
Molar mass776.87 g/mol
Physical formSolid
HS code38229090
InChIKeyXUIIKFGFIJCVMT-LBPRGKRZSA-N
IUPAC name(2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoic acid

About Levothyroxine WS

Levothyroxine WS is supplied by Zemixal as a characterised reference material for Levothyroxine analysis. Identity at a glance (Reference Standard): CAS 51-48-9, formula C15H11I4NO4 and molar mass 776.87 g/mol. It is handled as a solid.

Use cases we see most often

  • Identification & assay
  • Method development & validation
  • QC reference material

Storage and safety notes

It carries the GHS signal word Danger (H302, H361 and H372), so wear gloves and eye protection and work with good ventilation.

Standard pack sizes are 10 mg, 25 mg, 50 mg, 100 mg and 250 mg, and custom quantities are quoted on request. Each lot travels with a certificate of analysis with characterisation data. Send an enquiry through the quote panel and you get a formal offer with Incoterms and delivery time.

Reference standards for Levothyroxine

See every impurity, metabolite and related compound we list for this API.

Levothyroxine standards

Typical uses

  • Identification & assay
  • Method development & validation
  • QC reference material

Applications

Pharmaceutical Manufacturing and QCResearch Labs and Universities

Specifications and identifiers

Specifications of Levothyroxine WS
Product nameLevothyroxine WS
Catalogue numberZX-006613
CAS number51-48-9
IUPAC name(2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoic acid
Molecular formulaC15H11I4NO4
Molar mass776.87 g/mol
Exact mass776.6867
GradeReference Standard
Physical formSolid
XLogP32.4
H-bond donors / acceptors3 / 5
Topological polar surface area92.8 Ų
HS code38229090
InChIKeyXUIIKFGFIJCVMT-LBPRGKRZSA-N
SMILESC1=C(C=C(C(=C1I)OC2=CC(=C(C(=C2)I)O)I)I)C[C@@H](C(=O)O)N
PubChem CID5819
SynonymsO-(4-Hydroxy-3,5-diiodophenyl)-3,5-diiodo-L-tyrosine, (-)-Thyroxine, Levothyroxine, 3,3′,5,5′-Tetraiodo-L-thyronine, 3-[4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]-L-alanine, 3,3',5,5'-Tetraiodo-L-thyronine, Henning, L-Thyroxin, Thyrax, Thyreoideum, Thyroxin, Thyroxina l

Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.

Safety and GHS hazards

GHS07 Irritant or harmful
Irritant or harmful
GHS08 Health hazard
Health hazard

Signal word Danger

  • H302Harmful if swallowed
  • H361Suspected of damaging fertility or the unborn child
  • H372Causes damage to organs through prolonged or repeated exposure

Precautionary statements P203, P260, P264, P270, P280, P301 + P317, P318, P319, P330, P405, P501

Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.

Pack sizes

Pack sizes of Levothyroxine WS
10 mgQuoted on request
25 mgQuoted on request
50 mgQuoted on request
100 mgQuoted on request
250 mgQuoted on request
500 mgQuoted on request
1 gQuoted on request

Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.

Questions about Levothyroxine WS

Which CAS number identifies Levothyroxine WS?
Levothyroxine WS is registered under CAS 51-48-9. You may also see it listed as O-(4-Hydroxy-3,5-diiodophenyl)-3,5-diiodo-L-tyrosine, (-)-Thyroxine, Levothyroxine. Our catalogue number for this item is ZX-006613.
What are the formula and molar mass of Levothyroxine WS?
For Levothyroxine WS, its formula is C15H11I4NO4 and its molar mass is 776.87 g/mol. The systematic (IUPAC) name is (2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoic acid. InChIKey XUIIKFGFIJCVMT-LBPRGKRZSA-N lets you match it in any structure database.
How is Levothyroxine WS used in pharmaceutical QC?
Levothyroxine WS is a characterised reference material linked to Levothyroxine. Laboratories use it to identify and quantify this impurity during method development and validation, stability work, batch release testing and regulatory submissions.
What grade and pack sizes are available for Levothyroxine WS?
This listing is Reference Standard grade. Standard packs are 10 mg, 25 mg, 50 mg, 100 mg, 250 mg, 500 mg. Larger quantities and custom packing can be quoted on request.
Which documents come with Levothyroxine WS?
Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.
Can Zemixal ship Levothyroxine WS to my country?
Yes. Because Levothyroxine WS is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.

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