fluocortin butyl fluocortin butyl fluocortin butyl (brand names lenen, novoderm, varlane, vaspit), or fluocortin 21-butylate, is a synthetic glucocorticoid corticosteroid which is marketed in germany, belgium, luxembourg, spain, and italy. chemically, it is the butyl ester derivative of fluocortin. fluocortin butylclinical datatrade nameslenen, novoderm, varlane, vaspitother namesfcb; shk-203; fluocortin 21-butylate; fluocortin butylate; fluocortolone-21-carboxylate 21-butyl; 6α-fluoro-11β-hydroxy-16α-methyl-3,20-dioxopregna-1,4-dien-21-oic acid butyl esterdrug classcorticosteroid; glucocorticoididentifiers iupac name butyl 2-phenanthren-17-yl]-2-oxoacetate cas number41767-29-7pubchem cid15942715chemspider13085382unii6n7oa9mo7okeggd04217comptox dashboard (epa)dtxsid60194590 echa infocard100.050.476 chemical and physical dataformulac26h35fo5molar mass446.559 g·mol−13d model (jsmol)interactive image smiles ccccoc(=o)c(=o)1(c21(c(32c(c4=cc(=o)c=c34c)f)o)c)c inchi inchi=1s/c26h35fo5/c1-5-6-9-32-24(31)23(30)21-14(2)10-17-16-12-19(27)18-11-15(28)7-8-25(18,3)22(16)20(29)13-26(17,21)4/h7-8,11,14,16-17,19-22,29h,5-6,9-10,12-13h2,1-4h3/t14-,16+,17+,19+,20+,21-,22-,25+,26+/m1/s1key:xwtidfogtcvgqb-fhivuspvsa-n it was patented in 1971 and approved for medical use in 1977.