tert-butyl-[[(3S,8S,9S,10R,13R,14S,17S)-13-[(E)-3-chloroprop-2-enyl]-10-methyl-17-(2-methyl-1,3-dioxolan-2-yl)-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxy]-dimethylsilane 生成
3β-tertiobutyldimethylsilyloxy-18-ethynyl-20,20-ethylenedioxy-pregn-5-ene