You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclobutyl-6-[(1R)-1-(4-fluorophenyl)ethyl]-5-(2-pyrrolidin-1-ylethylamino)pyrazine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H30FN5O
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