Estra-4,9-diene-3,17-dione is a powerful pro-steroid chemically similar to the anabolic agent Trenbolone. When in the body, estra-4,9-diene-3,17-dione completes the conversion to Trenbolone. Trenbolone is a potent anabolic steroid, which binds to specific receptors present in reproductive tissue, muscle and fat. Estra Diene Dione (estra-4,9-diene-3,17-dione) is an anabolic steroid and a precursor to Estra Diene Dione. It became a controlled substance …