You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (15R)-2,16-dimethylspiro[hexacyclo[9.8.0.01,18.02,7.08,10.012,16]nonadec-6-ene-15,5'-oxolane]-2',5-dione by IUPAC nomenclature, provide its molecular formula.
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C24H30O3
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