1α,3β-bis[(t-butyldimethylsilyl)oxy]-23(S)-[(methanesulfonyl)oxy]-26,26,26,27,27,27-hexafluoro-9,10-secocholesta-5(Z),7(E),10(19)-trien-25-ol

1α,3β-bis[(t-butyldimethylsilyl)oxy]-23(R)-[(methanesulfonyl)oxy]-26,26,26,27,27,27-hexafluoro-9,10-secocholesta-5(Z),7(E),10(19)-trien-25-ol