You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5E)-5-[(3-bromo-4,5-dimethoxyphenyl)methylidene]-1-(3,4-dimethylphenyl)-1,3-diazinane-2,4,6-trione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H19BrN2O5
assistant