You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2Z,4aR,6aR,6bS,12aS,14aR,14bR)-2-(furan-2-ylmethylidene)-4,4,6a,6b,11,11,14b-heptamethyl-8a-(4-methylpiperazine-1-carbonyl)-1,4a,5,6,7,8,9,10,12,12a,14,14a-dodecahydropicen-3-one by IUPAC nomenclature, provide its molecular formula.
user
C40H58N2O3
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