<unk>  <unk>  is a potent irreversible aromatase inhibitor that inhibits estrogen biosynthesis by permanently binding and inactivating aromatase in adipose and peripheral tissue. It is used to control estrogen synthesis.<unk>  was present in some over-the-counter bodybuilding supplements until 2009, as well as Topical<unk>  solutions that work transdermally. The product was developed and commercialized in the dietary supplement market place by industry journeyman Bruce Kneller, who holds a United States Patent for use of the compound and related compounds (#7,939,517) and Gaspari Nutrition.<unk>  has many names in sports supplements including: 1,4,6 etiollochan-dione,<unk> , 17-keto-etiochol-triene, androst-1,4,6-triene-3,17-dione and many others. These all refer to CAS# 633-35-2.<unk>  may cause a positive test for the anabolic steroid Boldenone, of which it is a possible metabolite and production contaminant.<unk>  is also prohibited in amateur and professional sports which forbids aromatase inhibitors. A related agent is exemestane (Aromasin).
1,4,6-Androstatriene-3,17-dione
11β-Methyl-19-nortestosterone
16β,17α-Epiestriol
Methyl-1-testosterone
17β-Dihydroequilin
3α-Androstanediol
Testosterone hexahydrobenzoate
3-Methyl-19-methyleneandrosta-3,5-dien-17β-ol