You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule methyl (1S,4aR,5S,8aR)-5-[(3S)-3-hydroxy-3-methylpent-4-enyl]-1,4a-dimethyl-6-methylidene-3,4,5,7,8,8a-hexahydro-2H-naphthalene-1-carboxylate into molecular formula.
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C21H34O3
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