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(E)-(3S,6R)-3-(tert-Butyl-dimethyl-silanyloxymethyl)-6-((1aR,3aR,3bS,5aR,6R,8aS,8bS,10R)-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-hept-4-enoic acid ethyl ester