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  • (E)-4-[(8R,9S,13S,14S,16R,17S)-17-Acetoxy-3-(tert-butyl-dimethyl-silanyloxy)-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-16-yl]-but-2-enoic acid ethyl ester

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