You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[2-[4-bromo-2-[(3S,5R)-3,5-dimethylpiperidine-1-carbonyl]anilino]-2-oxoethyl]-3-methylbutanamide into its molecular formula.
user
C21H30BrN3O3
assistant