Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 55-06-1, Whether you call it Liothyronine Sodium, 3 -3 -5-Triiodo-L-thyronine Sodium Salt or L-Triiodothyronine Sodium you can be assured the Liothyronine Sodium products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.