You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(5Z)-5-[(2,4-dimethoxyphenyl)methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]-N-(4-fluorophenyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H17FN2O5S
assistant