You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3-bromophenyl)-N'-(2,5-dimethylfuran-3-carbonyl)-2-oxopyrrolidine-3-carbohydrazide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18BrN3O4
assistant