You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(aminomethyl)-4,4-dimethylcyclohexyl]-6-bromo-1,3-dimethyl-2-oxobenzimidazole-5-sulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H27BrN4O3S
assistant