Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 35380-71-3, Whether you call it Estradiol, Hemihydrate, 17-Beta-Estradiol , Estra-1 -3 -5(10)-triene-3 -17Beta-diol or Oestradiol you can be assured the Estradiol, Hemihydrate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.