You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (4aR,9R,9aR)-4,4,6,9a-tetramethyl-2,3,4a,7,8,9-hexahydro-1H-benzo[7]annulen-9-ol into its molecular formula.
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C15H26O
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