You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[3-(4-bromophenyl)-1,2,4-oxadiazol-5-yl]-2-oxopyridin-1-yl]-N-[(3-methoxyphenyl)methyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H19BrN4O4
assistant