de-A,B-25-cholesta-8,25-dien-8-yl trifluromethanesulfonate

(1S,2R,4S,6S)-2,4-diacetoxy-2-ethynyl-1-methyl-7-oxabicyclo[4.1.0]heptane

25-hydroxy-de-A,B-cholest-8-en-8-yl trifluoromethanesulfonate

(3S,5R)-3,5-bis[((tert-butyldiphenyl)silyl)oxy]-1-ethynyl-2-methylcyclohex-1-ene