Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 6893-02-3, Whether you call it 3,3',5-Triiodo-L-thyronine, Free Acid, O-(4-Hydroxy-3-iodophenyl)-3 -5-diiodo-L-tyrosine or Liothyronine you can be assured the 3,3',5-Triiodo-L-thyronine, Free Acid products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.