English name: levothyroxine sodium
English Name: L-Thyroxine sodium salt; sodium 4-o- (4-hydroxy-3,5-diiodophenyl) -3,5-diiodo-l-tyrosine; sodium (2S) -2-amino-3- [4- (4-hydroxy-3,5-diiodophenoxy) -3,5-diiodophenyl] propanoate hydrate (1: 1: 5); sodium 2-amino-3- [4- (4-hydroxy-3,5-diiodophenoxy) – 3,5-diiodophenyl] propanoate; tyrosine, O- (4-hydroxy-3,5-diiodophenyl) -3,5-diiodo-, sodium salt (1: 1)
CAS: 55-03-8
EINECS number: 200-221-4
Molecular formula: C15H11I4NNaO4
Molecular Weight: 799.8592
| Product Name | Levothyroxine Sodium |
| Synonyms | L-Thyroxine sodium salt; sodium 4-o-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-l-tyrosine; sodium (2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoate hydrate (1:1:5); sodium 2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoate; tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, sodium salt (1:1)L-Thyroxine sodium salt; sodium 4-o-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-l-tyrosine; sodium (2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoate hydrate (1:1:5); sodium 2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]propanoate; tyrosine, O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-, sodium salt (1:1) |
| Molecular Formula | C15H11I4NNaO4 |
| Molecular Weight | 799.8592 |
| CAS Registry Number | 25416-65-3 |
| EINECS | 200-221-4 |
| Molecular Structure | ![]() |
| Assay | 99% |
| Appearance | White or white crystalline powder |
Synthroid is a prescription medication that treats hypothyroidism. The active ingredient in Synthroid is called levothyroxine sodium. It is a synthetic hormone identical to thyroxine – the hormone that the thyroid gland naturally makes. Generally, thyroid replacement medication is to be taken for life. It may take several weeks for your symptoms to improve. Learn more about how Synthroid works to help restore your thyroxine balance.
Synthroid used to treat hyperthyroidism, obesity, or weight loss.





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