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(1S,2R,4aS,4bS,5R,6aR,9aS,10aS,10bS,12aS)-2-(tert-Butyl-dimethyl-silanyloxy)-5-hydroxy-1,4a,10a,10b-tetramethyl-7-(4-methyl-pent-3-enyl)-1,2,3,4,4a,4b,5,6,6a,9a,10,10a,10b,11,12,12a-hexadecahydro-9-oxa-pentaleno[2,1-a]phenanthren-8-one