(23RS,24RS)-24-bromo-23,24-(dibromomethylene)-6β-methoxy-3α,5-cyclo-5α-cholestane

ethyl (23Z)-6β-methoxy-24-(trimethylsilyl)-3α,5-cyclo-5α-cholest-23-en-21-oate

Toluene-4-sulfonic acid (Z)-(R)-2-((1aR,3aR,3bS,5aS,6R,8aS,8bS,10R,10aR)-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-6-methyl-5-trimethylsilanyl-hept-4-enyl ester