You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule methyl 2-[(4Z)-4-[[2-[(3-methylphenyl)methoxy]phenyl]methylidene]-5-oxo-2-sulfanylideneimidazolidin-1-yl]acetate .
user
C21H20N2O4S
assistant