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What is the molecular formula of the compound with this IUPAC name (3R,4aS,6aS,6bR,10aR,11aS,11bR)-3-[tert-butyl(dimethyl)silyl]oxy-6b-hydroxy-4,4,6a,10a,11b-pentamethyl-2,3,4a,5,6,7,11,11a-octahydro-1H-benzo[a]fluorene-8,10-dione ?
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C28H48O4Si
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