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 (9E)-6-(2-hydroxyethyl)-9-[hydroxy(phenyl)methylidene]-1,3,6-triazaspiro[4.4]nonane-2,4,7,8-tetrone is given. What is its corresponding molecular formula?
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C15H13N3O6
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