You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-(4-fluorophenyl)-2-methylpropyl]-2-methyl-3-[(1,3,5-trimethylpyrazol-4-yl)methyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H28FN5
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