(三氟甲基)三甲基硅烷 、
6-[17β-(tert-butyldimethylsilyloxy)-3-methoxy-8-vinylestra-1,3,5(10)-trien-11β-yl]-1,1,1-trifluorohexan-2-one 以yields 200 mg of the column-chromatographically stable trimethylsilyl ether 17a as a light yellow, viscous mass (GC-MS: m/z theor.: 720, pract.: 720)的产率得到17beta-tert.-Butyldimethylsilyloxy-3-methoxy-11beta-[6,6,6-trifluoro-5-trifluoromethyl-5-(trimethylsilyloxy)hexyl]-8-vinyl-estra-1,3,5(10)-triene