clobetasone butyrate clobetasone butyrate clobetasone butyrate is a synthetic glucocorticoid corticosteroid and a corticosteroid ester. clobetasone butyrateclinical datadrug classcorticosteroid; glucocorticoididentifiers iupac name (16β)-21-chloro-9-fluoro-16-methyl-3,11,20-trioxopregna-1,4-dien-17-yl butyrate cas number25122-57-0chemspider64481unii8u0h6xi6eocomptox dashboard (epa)dtxsid3046823 echa infocard100.042.381 chemical and physical dataformulac26h32clfo5molar mass478.99 g·mol−13d model (jsmol)interactive image smiles cccc(=o)o1((c21(cc(=o)3(2ccc4=cc(=o)c=c43c)f)c)c)c(=o)ccl inchi inchi=1s/c26h32clfo5/c1-5-6-22(32)33-26(21(31)14-27)15(2)11-19-18-8-7-16-12-17(29)9-10-23(16,3)25(18,28)20(30)13-24(19,26)4/h9-10,12,15,18-19h,5-8,11,13-14h2,1-4h3/t15-,18-,19-,23-,24-,25-,26-/m0/s1key:fbrawbyqgrlcek-avvstmbfsa-n