Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 4956-37-0, Whether you call it 17beta-Estradiol 17-Enanthate, 3 -17&#223, -Dihydroxy-1 -3 -5[10]-estratriene 17-Enanthate , Estradiol 17-Heptanoate , 1 -3 -5(10)-Estratrien-3 -17&#223 or -diol 17-Enanthate you can be assured the 17beta-Estradiol 17-Enanthate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.