You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule [7-(ethoxycarbonylamino)-2-oxochromen-4-yl]methyl 2-(1-methyl-4-oxopyrazolo[3,4-d]pyrimidin-5-yl)acetate into molecular formula.
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C21H19N5O7
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