You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (E)-3-[5-bromo-4-(diethylamino)-2-methoxyphenyl]-2-(3,5-dimethylpyrazole-1-carbonyl)prop-2-enenitrile ?
user
C20H23BrN4O2
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