You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
dimethyl 2-[(4aS,6S)-2,3,4,4a,5,6-hexahydro-1H-benzo[7]annulen-6-yl]propanedioate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H22O4
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