1(S),3(R)-bis[(tert-butyldimethylsilyl)oxy]-20(S)-(iodomethyl)-9,10-seco-27-norcholesta-5(E),7(E),10(19)triene

ethyl (1S),3(R)-bis<(tert-butyldimethylsilyl)oxy>-9,10-seco-26,27-bisnorcholesta-5(E),7(E),10(19)-trien-25-oate