You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name (2S)-5-hydroxy-2-(3-hydroxy-4-methoxyphenyl)-8,8-dimethyl-2,3-dihydropyrano[2,3-h]chromen-4-one into its molecular formula.
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C21H20O6
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