Product name : Tetraiodothyronine ,T4, L-Thyroxine ,Levothyroxine Alias: L-Thyroxine,3,3′,5,5′-Tetraiodo-L-thyronine,3-[4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]-L-alanine CAS: 51-48-9 Einecs: 200-101-1 MF: C15H11I4NO4 MW: 776.87 Purity: 99.3% min Appearance: White Crystalline Solid Grade : Pharmaceutical Grade Storage: Shading, confined preservation