You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N,N-dimethyl-1-(1-methylpyrazol-4-yl)-N'-[1-(4-nitrophenyl)ethyl]ethane-1,2-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H23N5O2
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