You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(4-methylpiperidine-1-carbonyl)-N,N-dipropyl-5,6,7,8-tetrahydroimidazo[1,5-a]pyridine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H34N4O2
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