You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name N-[(Z)-3-[2-(3-methyl-1-benzofuran-2-carbonyl)hydrazinyl]-3-oxo-1-phenylprop-1-en-2-yl]acetamide ?
user
C21H19N3O4
assistant