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Pharmacopeial Impurities (EP / USP / BP)

Levothyroxine EP Impurity K

Reference StandardAvailable on request

Levothyroxine EP Impurity K (CAS 5817-39-0) supplier Zemixal. Lab and bulk packs, batch COA, fast global delivery. Ships from India to 120+ countries.

Pack sizes
Levothyroxine EP Impurity K chemical structure
CAS number5817-39-0
FormulaC15H12I3NO4
Molar mass650.97 g/mol
Physical formSolid
HS code38229090
InChIKeyHZCBWYNLGPIQRK-LBPRGKRZSA-N
IUPAC name(2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3-iodophenyl]propanoic acid

About Levothyroxine EP Impurity K

Levothyroxine EP Impurity K is supplied by Zemixal as a characterised reference material for Levothyroxine analysis. Identity at a glance (Reference Standard): CAS 5817-39-0, formula C15H12I3NO4 and molar mass 650.97 g/mol. It is handled as a solid.

Use cases we see most often

  • Pharmacopeial method verification
  • Impurity profiling
  • QC release testing
  • ANDA / DMF filings

Handling and storage

Classified under GHS with signal word Warning and hazard statements H302, H312 and H332. Read the SDS before first use.

Available as 10 mg, 25 mg, 50 mg and 100 mg. Larger or split packs can be arranged. Every shipment includes a certificate of analysis with characterisation data. Request pricing online and we confirm availability, documentation and freight to your country.

Reference standards for Levothyroxine

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

Levothyroxine standards

Typical uses

  • Pharmacopeial method verification
  • Impurity profiling
  • QC release testing
  • ANDA / DMF filings

Applications

Pharmaceutical Manufacturing and QCResearch Labs and Universities

Grade guides

Ph. Eur. Grade (European Pharmacopoeia)

Specifications and identifiers

Specifications of Levothyroxine EP Impurity K
Product nameLevothyroxine EP Impurity K
Catalogue numberZX-032826
CAS number5817-39-0
IUPAC name(2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3-iodophenyl]propanoic acid
Molecular formulaC15H12I3NO4
Molar mass650.97 g/mol
Exact mass650.7901
GradeReference Standard
Physical formSolid
XLogP31.7
H-bond donors / acceptors3 / 5
Topological polar surface area92.8 Ų
HS code38229090
InChIKeyHZCBWYNLGPIQRK-LBPRGKRZSA-N
SMILESC1=CC(=C(C=C1C[C@@H](C(=O)O)N)I)OC2=CC(=C(C(=C2)I)O)I
PubChem CID644280
SynonymsLevothyroxine - Impurity K, 3,3',5'-Triiodo-L-thyronine, Reverse T3, Triiodothyronine, reverse, L-Tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3-iodo-, 3',5',3-Triiodothyronine, 3,3,5 Triiodothyronine, 3,3,5-Triiodothyronine, 4-(4-hydroxy-3,5-diiodophenoxy)-3-iodophenylalanine, 3,3',5'-Triiodothyronine, (S)-2-Amino-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3-iodophenyl)propanoic acid, Isoliothyronine

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

Signal word Warning

  • H302Harmful if swallowed
  • H312Harmful in contact with skin
  • H332Harmful if inhaled

Precautionary statements P261, P264, P270, P271, P280, P301 + P317, P302 + P352, P304 + P340, P317, P321, P330, P362 + P364, 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 EP Impurity K
10 mgQuoted on request
25 mgQuoted on request
50 mgQuoted on request
100 mgQuoted 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 EP Impurity K

Which CAS number identifies Levothyroxine EP Impurity K?
Levothyroxine EP Impurity K is registered under CAS 5817-39-0. You may also see it listed as Levothyroxine - Impurity K, 3,3',5'-Triiodo-L-thyronine, Reverse T3. Our catalogue number for this item is ZX-032826.
What are the formula and molar mass of Levothyroxine EP Impurity K?
For Levothyroxine EP Impurity K, its formula is C15H12I3NO4 and its molar mass is 650.97 g/mol. The systematic (IUPAC) name is (2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3-iodophenyl]propanoic acid. InChIKey HZCBWYNLGPIQRK-LBPRGKRZSA-N lets you match it in any structure database.
How is Levothyroxine EP Impurity K used in pharmaceutical QC?
Levothyroxine EP Impurity K 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 EP Impurity K?
This listing is Reference Standard grade. Standard packs are 10 mg, 25 mg, 50 mg, 100 mg. Larger quantities and custom packing can be quoted on request.
Which documents come with Levothyroxine EP Impurity K?
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 EP Impurity K to my country?
Yes. Because Levothyroxine EP Impurity K 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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