You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[6-(4-bromophenyl)-7-methyl-1-oxo-4,6,7,8,9,9a-hexahydro-3H-pyrido[2,1-c][1,4]oxazin-3-yl]methyl]isoindole-1,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H23BrN2O4
assistant