苄氧基乙酰氯 、
(17E)-6β-methoxy-3α,5-cyclo-5α-pregn-17(20)-en-16α-ol 以93%的产率得到Benzyloxy-acetic acid (1aR,3aR,3bS,5aS,7R,8aS,8bR,10R,10aR)-6-eth-(E)-ylidene-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-7-yl ester