You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (5Z)-5-[[3-bromo-4-[(4-chlorophenyl)methoxy]-5-ethoxyphenyl]methylidene]-1,3-dimethyl-2-sulfanylideneimidazolidin-4-one ?
user
C21H20BrClN2O3S
assistant