You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(5-bromopyridin-3-yl)-1,3-benzoxazol-5-yl]-2-(4-chloro-3-methylphenoxy)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H15BrClN3O3
assistant