(6S)-SO2 adduct of 1(S),3(R)-bis(tert-butyldimethylsilyloxy)-20(S)-formyl-9,10-secopregna-5,7(E),10(19)-triene

((1R,3R,E)-5-((E)-2-((1R,3As,7Ar)-1-((2R,5R,E)-5,6-Dimethylhept-3-En-2-Yl)-7A-Methyldihydro-1H-Inden-4(2H,5H,6H,7H,7Ah)-Ylidene)Ethylidene)-4-Methylenecyclohexane-1,3-Diyl)Bis(Oxy)Bis(Tert-Butyldimethylsilane)

Vitamin D2 SO2 Adduct

(5E)-vitamin D2 tert-butyldimethylsilyl ether

(1S,3R,5E,7E)-1,3-Bis-[(tert-butyldimethylsilyl)oxy]-9,10-secopregna-5,7,10-triene-20-carboxaldehyde

1(S),3(R)-bis[(tert-butyldimethylsilyl)oxy]-20(R)-formyl-9,10-secopregna-5(E),7(E),10(19)-triene