You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (7R,10S,13S,17R)-7-ethylsulfonyl-10,13-dimethylspiro[2,6,7,8,12,14,15,16-octahydro-1H-cyclopenta[a]phenanthrene-17,5'-oxolane]-2',3-dione by IUPAC nomenclature, provide its molecular formula.
user
C24H32O5S
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