You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule methane;8-(2-methoxyethoxy)-10,10-dimethyl-5-oxo-7-propan-2-yloxy-11H-benzo[b]fluorene-2-carbonitrile into molecular formula.
user
C27H31NO4
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