You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[3-[(6-bromo-2-methyl-4-oxoquinazolin-3-yl)iminomethyl]indol-1-yl]methyl]benzonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H18BrN5O
assistant