L-Thyroxine Sodium is one of our strong products, and the table below shows its main specifications: Product NameL-Thyroxine SodiumLevothyroxine sodium Sodium 4-O-(4-hydroxy-3,5-diiodophenyl)-3,5-diiodo-L-tyrosine CAS#25416-65-3MFC15H10I4NNaO4.xH2OMW(Anhydrous)798.86 Specific rotation-5.0 -6.00(C=3, in 1NNaOH:C2H5OH=1:2)Assay 99%(min) Custom synthesis availablePlease feel free to advise if you have specific requirementsfor relative products