You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[(Z)-[(Z)-2-bromo-3-phenylprop-2-enylidene]amino]-3-(4-ethylphenyl)-1H-pyrazole-5-carboxamide .
user
C21H19BrN4O
assistant