(8β,20R,22E)-[(methyloxymethyl)oxy]-des-A,B-17α,21-cyclocholest-22-en-8-ol

(20R)-1α-[(tert-butyldimethylsilyl)oxy]-2-methylene-25-[(tert-butyldimethyl-silyl)oxy]-19-nor-22(E)-ene-vitamin D3 tert-butyldimethylsilyl ether