You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-(1-methylpyrazol-4-yl)phenyl]-4-(1,2,3,6-tetrahydropyridin-4-yl)pyrazolo[1,5-a]pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H21N5
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