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 2-[4-[(5-bromo-2-butyl-4-cyclopropyl-6-oxopyrimidin-1-ium-1-ylidene)methyl]phenyl]benzonitrile ?
user
C25H23BrN3O+
assistant