You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named methyl (3S)-3-(2H-chromen-3-yl)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)propanoate is given. What is its corresponding molecular formula?
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C28H22O7
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