Estra-4,9-dien-3,17-dione
This is another steroid precursor, a dione to be specific. Diones only have moderately decent conversion, so this product will not possess the full activity of its active metabolite. The active metabolite in this case is the nandrolone derivative Estra-4,9-dien-17b-ol-3-one and according to Vida, it has an anabolic potency equal to methyltestosterone and an androgenic potency 0.1 times.
It does not appear from my knowledge of steroid metabolism that this steroid aromatizes. However the potential for progestational activity is there, as it is with many 19-norandrogens. This stuff has been referred to as a trenbolone precursor, however this is inaccurate because trenbolone has an additional double bond in the structure and the body does not have the capacity (as far as i know) to insert this double bond. Bottom line is that this is a weak hormone with so-so conversion that probably requires 50mg-100mg for physiological effects to be seen in most men. On the upside the fact that it is not 17a-alkylated, so liver toxicity is not a serious issue.