(1α,3β,5E,7E,22E)-24-Cyclopropyl-1,3-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-9,10-secochola-5,7,10(19),22-tetraen-24-one; (2E,4R)-4-[(1R,3aS,4E,7aR)-4-[(2E)-2-[(3S,5R)-3,5-Bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-2-methylenecyclohexylidene]ethylidene]octahydro-7a-methyl-1H-inden-1-yl]-1-cyclopropyl-2-penten-1-one

Intermediate in the preparation of Vitamin D analogs.