You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(5-bromo-2-chlorophenyl)-N-methyl-N-[(1-methylpyrazol-4-yl)methyl]ethane-1,2-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H18BrClN4
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