C15H11I4NO4
776.87 g/mol
APIDanger
Thyroxine
CAS51-48-9EC200-101-1
Category
API
Compound Class
Natural Product
Primary Use
Pharmaceutical Raw Material
Thyroxine is a thyroid hormone and the L-enantiomer of thyroxine. It functions as a human and mouse metabolite and is used as an active pharmaceutical ingredient.
pharmaceutical raw materialveterinary medicationlaboratory research
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
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pharmaceutical raw material
Referencestereoisomer of
Levothyroxine sodium
CAS55-03-8
pharmaceutical raw material
Referencestereoisomer of
Levothyroxine sodium pentahydrate
CAS6106-07-6
pharmaceutical raw material
Safety Reference
Danger
H302Harmful if swallowed
H361Suspected of damaging fertility or the unborn child
H372Causes damage to organs through prolonged or repeated exposure
Customs Tariff Classification
The international HS code for Thyroxine (CAS 51-48-9) is 2937.90.
HS code (international, 6-digit)
2937.90
EU CN code (8-digit)
2937 90 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
(2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoic acid
InChIKey
XUIIKFGFIJCVMT-LBPRGKRZSA-N
SMILES
C1=C(C=C(C(=C1I)OC2=CC(=C(C(=C2)I)O)I)I)C[C@@H](C(=O)O)N
Synonyms (71)
- L-T4
- T44
- THX
- Levothyroxine, United States Pharmacopeia (USP)
- 1hk1
- 1hk2
- 1hk3
- 1hk4
- 1hk5
- 1y0x
- 2ceo
- 3,5,3',5'-Tetraiodothyronine
- DL-Thyroxin
- Forthyron (TN)
- Henning
- L Thyrox
- L Thyroxin Henning
- L Thyroxin beta
- L Thyroxine Roche
- L-3,5,5'-tetraiodothyronine
- L-Thyroxin
- L-Thyroxine (Standard)
- L-Thyroxine, >=98% (HPLC)
- L-Thyroxine, free acid
- L-thyroxine
- Laevothyroxinum
- Laevothyroxinum (acid)
- Levothroid (*Sodium salt*)
- Levothyroxin
- Levothyroxin Delalande
- Levothyroxine (BAN)
- Levothyroxine;T4
- Levothyroxinum
- Levothyroxinum (acid)
- SK&F 1-6528
- Synthetic levothyroxine
- Synthroid (*Sodium salt*)
- Tetraiodothyronine
- Thryroxine, l-
- Thyratabs
- Thyrax
- Thyreoideum
- Thyroxinal
- Thyroxine (VAN)
- Thyroxine (l)
- Thyroxine iodine
- levothyroxine
- t4
- thyroxin
- thyroxine
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