lithium butyldimethyl (E)-2,3-dimethylbutenylalanate 、
6β-Methoxy-3α,5-cyclo-5α-pregnane-20α-carboxaldehyde 以8%的产率得到(E)-(2S,3S)-2-((1aR,3aR,3bS,5aS,6R,8aS,8bS,10aR)-10-Methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-5,6-dimethyl-hept-4-en-3-ol