You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-oxo-N-[6-(2-pyrrolidin-1-ylethoxy)pyridin-3-yl]-1,5,6,7-tetrahydroindole-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24N4O3
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