Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 315-37-7, Whether you call it Testosterone Enanthate, 17β, -Hydroxyandrost-4-en-3-one Heptanoate , 4-Androsten-17β, -ol-3-one-17-Enanthate , 4-Androsten-17β, -ol-3-one 17-Enanthate or Testosterone Heptanoate you can be assured the Testosterone Enanthate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.