You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(5E)-2,4-dioxo-5-[(E)-3-phenylprop-2-enylidene]-1,3-thiazolidin-3-yl]-N-(4-iodophenyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H15IN2O3S
assistant