You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-[3-(2-bromo-3,5-dimethoxyphenyl)-4-oxoquinazolin-2-yl]ethyl]-N-(3-methylbutyl)cyclohexanecarboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H38BrN3O4
assistant