You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-(1H-indol-3-yl)-N-[[2-(1-methylpyrazol-4-yl)pyridin-3-yl]methyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C20H19N5O
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