testosterone benzoate testosterone benzoate testosterone benzoate, or testosterone 17β-benzoate, also known as androst-4-en-17β-ol-3-one 17β-benzoate, is a synthetic, injected anabolic–androgenic steroid (aas) and an androgen ester – specifically, the benzoate c17β ester of testosterone – which was never marketed. it is a prodrug of testosterone and, when administered via intramuscular injection, is associated with a long-lasting depot effect and extended duration of action. the drug was first described in 1936 and was the first androgen ester and ester of testosterone to be synthesized. testosterone benzoateclinical dataother namestestosterone 17β-benzoate; androst-4-en-17β-ol-3-one 17β-benzoateroutes ofadministrationintramuscular injectionidentifiers iupac name phenanthren-17-yl] benzoate cas number2088-71-3pubchem cid101474chemspider91692unii387187kt3ecomptox dashboard (epa)dtxsid50943135 echa infocard100.016.575 chemical and physical dataformulac26h32o3molar mass392.539 g·mol−13d model (jsmol)interactive image smiles c12cc3(1cc2oc(=o)c4=cc=cc=c4)ccc5=cc(=o)cc35c inchi inchi=1s/c26h32o3/c1-25-14-12-19(27)16-18(25)8-9-20-21-10-11-23(26(21,2)15-13-22(20)25)29-24(28)17-6-4-3-5-7-17/h3-7,16,20-23h,8-15h2,1-2h3/t20-,21-,22-,23-,25-,26-/m0/s1key:rzjscadwiwngki-ixknjlpqsa-n