Liothyronine I-123 is radioactive iodine.

60345-90-6

C15H12I3NO4

638.98

(123I)-Triiodothyronine;Liothyronine I-123

(< 1 mg/ml refers to the product slightly soluble or insoluble )
Powder: -20°C for 3 years
In solvent: -80°C for 2 years