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9-{3-[3-(tert-butyl-dimethyl-silanyloxymethyl)-2,3-dimethyl-oxiranyl]-2-hydroxy-1-methyl-propyl}-3-(dimethyl-phenyl-silanyl)-1b-hydroxy-5a-methyl-1b,2,3,4,5a,5b,6,7,11b,11c-decahydro-1aH-1-oxa-cyclopropa[g]chrysen-5-one