 Trenbolone acetate, or trenbolone 17β-acetate, is a synthetic estrane steroid and a derivative of nandrolone (19-nortestosterone).It is the C17β acetate ester of trenbolone, which itself is δ9,11-19-nortestosterone (δ9,11-19-NT) or estra-4,9,11-trien-17β-ol-3-one.Other trenbolone esters include trenbolone enanthate, trenbolone hexahydrobenzylcarbonate, and trenbolone undecanoate.