中文名字：L-甲状腺素

Product Name:L-thyroxine
Synonyms:3,3,5,5'-Tetraiodo-L-thyronine
Molecular Formula: HOC₆H₂(I)₂OC₆H₂(I)₂CH₂CH(NH2)CO₂H
CAS #:51-48-9

Test Items	Standard
Appearance	White to off-white powder
Assay	98.0% to 101.0%
Specific Rotation [醈20/D	−5.3?.5? c = 1% in 1 M NaOH + EtOH 1:2
Chloride (Cl)	Not more than 0.10%
Heavy Metals (Pb)	Not more than 10 PPM
Loss on Drying	Not more than 0.20%
Residue on Ignition (Sulfated)	Not more than 0.20%