You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[(1R,2S,8R,9S)-11-[(5-methoxy-4-oxo-1H-pyridin-2-yl)methyl]-6-oxo-7,11-diazatricyclo[7.3.1.02,7]tridecan-8-yl]methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H30N4O4
assistant