You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Can you give the molecular formula of the molecule (1R,4aS,4bS,8aR,10aS)-4b,8,8,10a-tetramethyl-1-(3-methylbut-2-enyl)-2-methylidene-1,3,4,4a,5,6,7,8a,9,10-decahydrophenanthrene ?
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C24H40
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