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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 6451352Generated: October 23, 2026

3,3',5,5'-Tetraiodothyroformic acid

THYROFORMIC ACID · Levothyroxine Impurity-H · Tetraiodothyroformic Acid · 3,5-DIIODOTHYROFORMIC ACID · Levothyroxine EP IMpurity H · Levothyroxine Acid Impurity · Levothyroxine T4 benzoic acid · Levothyroxine Benzoic Acid Impurity

https://huagongshe.com/en/chemical/6451352

3,3',5,5'-Tetraiodothyroformic acid molecular structure

Identifiers & Physical Properties

CAS No.2055-97-2
Molecular formulaC13H6I4O4
Average molar mass733.8 g/mol
Monoisotopic mass733.64450067 g/mol
SMILESO=C(O)c1cc(I)c(Oc2cc(I)c(O)c(I)c2)c(I)c1
InChIKeyHKJUOMPYMPXLFS-UHFFFAOYSA-N
PubChem CID6451352
DTXSIDDTXSID00174553

Chemical & Physical Properties

XLogP5.2
Topological polar surface area66.8
Hydrogen bond donors2
Hydrogen bond acceptors4
Rotatable bonds3
Heavy atoms21
Formal charge0
Complexity359
Melting point236-239°C (dec.)
Boiling point525.4±50.0 °C(Predicted)
Density2.830±0.06 g/cm3(Predicted)
Storage conditionsRefrigerator
SolubilityChloroform (Slightly), DMSO (Slightly), Ethyl Acetate (Slightly), Methanol (Slightly)
pKa (acidity coefficient)3.48±0.10(Predicted)
Physical stateSolid
ColorWhite to Light Brown
Major applicationspharmaceutical small molecule
InChIInChI=1S/C13H6I4O4/c14-7-3-6(4-8(15)11(7)18)21-12-9(16)1-5(13(19)20)2-10(12)17/h1-4,18H,(H,19,20)
InChIKeyHKJUOMPYMPXLFS-UHFFFAOYSA-N
SMILESC(O)(=O)C1=CC(I)=C(OC2=CC(I)=C(O)C(I)=C2)C(I)=C1
FDA UNII069P3V0KG2

Applications & Uses

Uses

3,3'',5,5''-Tetraiodo Thyroformic Acid (Levothyroxine EP Impurity H; T4-Benzoic Acid (USP)) is a thyroid hormone analogue and a potent Thyroxine impurity.