You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-(4b-hydroxy-10-oxo-7-propan-2-ylindeno[1,2-b][1]benzofuran-9b-yl)-2-oxo-2-(3,4,5-trimethoxyphenyl)acetamide into molecular formula.
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C29H27NO8
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