You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named methyl (4aS,6aR,6bS,8aR,12aS)-11-cyano-10-hydroxy-2,2,6a,6b,12a-pentamethyl-9-methylidene-14-oxo-3,4,5,6,7,8,8a,12,14a,14b-decahydro-1H-picene-4a-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C31H41NO4
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