You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[(5Z)-5-[(3-bromophenyl)methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]ethyl]-3-(2,5-dimethylphenyl)thiourea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H20BrN3O2S2
assistant