You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-ethyl-1-phenyl-N-[2-(4-pyrimidin-2-ylpiperazin-1-yl)ethyl]pyrazole-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C22H27N7O
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