testosterone butyrate testosterone butyrate testosterone butyrate, or testosterone butanoate, also known as androst-4-en-17β-ol-3-one 17β-butanoate, is a synthetic, steroidal androgen and an androgen ester – specifically, the c17β butanoate ester of testosterone – which was first synthesized in the 1930s and was never marketed. its ester side-chain length and duration of effect are intermediate between those of testosterone propionate and testosterone valerate. parenteral durations of androgens/anabolic steroids medicationformmajor brand namesduration testosteroneaqueous suspensionandronaq, sterotate, virosterone2–3 days testosterone propionateoil solutionandroteston, perandren, testoviron3–4 days testosterone phenylpropionateoil solutiontestolent8 days testosterone isobutyrateaqueous suspensionagovirin depot, perandren m14 days mixed testosterone estersaoil solutiontriolandren10–20 days mixed testosterone estersboil solutiontestosid depot14–20 days testosterone enanthateoil solutiondelatestryl14–28 days testosterone cypionateoil solutiondepovirin14–28 days mixed testosterone esterscoil solutionsustanon 25028 days testosterone undecanoateoil solutionaveed, nebido100 days testosterone buciclatedaqueous suspension20 aet-1, cdb-1781e90–120 days nandrolone phenylpropionateoil solutiondurabolin10 days nandrolone decanoateoil solutiondeca durabolin21–28 days methandriolaqueous suspensionnotandron, protandren8 days methandriol bisenanthoyl acetateoil solutionnotandron depot16 days metenolone acetateoil solutionprimobolan3 days metenolone enanthateoil solutionprimobolan depot14 days note: all are via i.m. injection. footnotes: a = tp, tv, and tue. b = tp and tkl. c = tp, tpp, tica, and td. d = studied but never marketed. e = developmental code names. sources: see template. testosterone butyrateclinical dataroutes ofadministrationintramuscular injectionidentifiers iupac name phenanthren-17-yl] butanoate cas number3410-54-6pubchem cid102409chemspider92494unii9rd3x2793ycomptox dashboard (epa)dtxsid40955646 echa infocard100.020.270 chemical and physical dataformulac23h34o3molar mass358.522 g·mol−13d model (jsmol)interactive image smiles cccc(=o)o1cc21(cc32ccc4=cc(=o)cc34c)c inchi inchi=1s/c23h34o3/c1-4-5-21(25)26-20-9-8-18-17-7-6-15-14-16(24)10-12-22(15,2)19(17)11-13-23(18,20)3/h14,17-20h,4-13h2,1-3h3/t17-,18-,19-,20-,22-,23-/m0/s1key:omptuwylcdefsj-wauhafjusa-n