Thyroxine

Thyroxine
Names
	Other names O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-L-tyrosine, (-)-thyroxine, 3,3′,5,5′-tetraiodo-L-thyronine
Identifiers
CAS Number	51-48-9 l enantiomer; 300-30-1 DL;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30660;
ChEMBL	ChEMBL42115;
ChemSpider	830;
EC Number	206-088-9;
PubChem CID	853;
UNII	QR0BV3BRIA;
CompTox Dashboard (EPA)	DTXSID0023662 ;
	InChI InChI=1S/C15H11I4NO4/c16-8-4-7(5-9(17)13(8)21)24-14-10(18)1-6(2-11(14)19)3-12(20)15(22)23/h1-2,4-5,12,21H,3,20H2,(H,22,23) Key: XUIIKFGFIJCVMT-UHFFFAOYSA-N;
	SMILES C1=C(C=C(C(=C1I)OC2=CC(=C(C(=C2)I)O)I)I)CC(C(=O)O)N;
Properties
Chemical formula	C15H11I4NO4
Molar mass	776.874 g·mol−1
Appearance	white solid
Melting point	235–236 °C (455–457 °F; 508–509 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Thyroxine, also known as T₄, is a hormone produced by the thyroid gland. It is the primary form of thyroid hormone found in the blood and acts as a prohormone of the more active thyroid hormone, triiodothyronine (T₃). Thyroxine and its active metabolites are essential for regulating metabolic rate, supporting heart and muscle function, promoting brain development, and maintaining bone health.