You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[4-[[3-[4-(N-methoxycarbonylcarbamimidoyl)phenyl]-2-oxo-1,3-oxazolidin-5-yl]methyl]-2-oxopiperazin-1-yl]acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H27N5O7
assistant