aromatization of 1-testosterone and its derivatives (i.e. 1-AD)
Endocrinology, volume 70 (1962), 149-58
"Several highly purified synthetic steroids of the 1-3keto-5alpha-androstane series (1-test and 1-dione) were compared with the isomeric 4-derivatives (testosterone and 4-adione) in a number of biological assays. The 1- compounds were not converted to estrone by human placental enzymes as 4- compounds were"
Translation: These 1-AD related compounds do not aromatize to estrogens, like testosterone and its derivatives do