You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (8'S,9'S,10'R,13'R,14'S,17'S)-4'-benzoyl-17'-ethyl-10',13'-dimethylspiro[1,3-dioxolane-2,2'-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthrene]-3'-one into its molecular formula.
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C30H40O4
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