You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-[(8S,9S,10R,13S,14S,17S)-17-hydroxy-10,13-dimethyl-3-oxo-7,8,9,14,15,16-hexahydro-6H-cyclopenta[a]phenanthren-17-yl]propanoic acid by IUPAC nomenclature, provide its molecular formula.
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C22H28O4
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