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 2-amino-4-(2-methoxy-5-oxo-6-propan-2-yl-7H-pyrrolo[3,4-b]pyridin-3-yl)-5,6,7,8-tetrahydroquinoline-3-carbonitrile into molecular formula.
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C21H23N5O2
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