You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S,4R,4aS)-1,4,4a,7-tetramethyl-2,3,4,5,8,9-hexahydrobenzo[7]annulen-2-ol by IUPAC nomenclature, provide its molecular formula.
user
C15H24O
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