You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [2-oxo-2-(6,10,13,16-tetramethyl-3-oxo-1,2,6,7,8,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl)ethyl] acetate into its molecular formula.
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C25H34O4
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