You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
butyl 4-[[4-(6,8-dihydro-5H-imidazo[1,2-a]pyrazin-7-yl)piperidine-1-carbonyl]amino]benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H31N5O3
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