You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (1'R,4R,5'S,6R,6aS,10aS)-1,6-dihydroxy-7,7,10a-trimethyl-1',3-di(propan-2-yl)spiro[6a,8,9,10-tetrahydro-6H-acephenanthrylene-4,4'-bicyclo[3.1.0]hexane]-2,5-dione into molecular formula.
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C30H40O4
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